<?xml version="1.0" encoding="UTF-8" ?>
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     http://www.apache.org/licenses/LICENSE-2.0

 Unless required by applicable law or agreed to in writing, software
 distributed under the License is distributed on an "AS IS" BASIS,
 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
-->

<!--
     For more details about configurations options that may appear in
     this file, see https://solr.apache.org/guide/configuring-solrconfig-xml.html.
-->
<config>
  <!-- In all configuration below, a prefix of "solr." for class names
       is an alias that causes solr to search appropriate packages,
       including org.apache.solr.(search|update|request|core|analysis)

       You may also specify a fully qualified Java classname if you
       have your own custom plugins.
    -->

  <!-- Controls what version of Lucene various components of Solr
       adhere to.  Generally, you want to use the latest version to
       get all bug fixes and improvements. It is highly recommended
       that you fully re-index after changing this setting as it can
       affect both how text is indexed and queried.
  -->
  <luceneMatchVersion>9.0</luceneMatchVersion>

  <!-- <lib/> directives can be used to instruct Solr to load any Jars
       identified and use them to resolve any "plugins" specified in
       your solrconfig.xml or schema.xml (ie: Analyzers, Request
       Handlers, etc...).

       All directories and paths are resolved relative to the
       instanceDir.

       Please note that <lib/> directives are processed in the order
       that they appear in your solrconfig.xml file, and are "stacked"
       on top of each other when building a ClassLoader - so if you have
       plugin jars with dependencies on other jars, the "lower level"
       dependency jars should be loaded first.

       If a "./lib" directory exists in your instanceDir, all files
       found in it are included as if you had used the following
       syntax...

              <lib dir="./lib" />
    -->

  <!-- A 'dir' option by itself adds any files found in the directory
       to the classpath, this is useful for including all jars in a
       directory.

       When a 'regex' is specified in addition to a 'dir', only the
       files in that directory which completely match the regex
       (anchored on both ends) will be included.

       If a 'dir' option (with or without a regex) is used and nothing
       is found that matches, a warning will be logged.

       The examples below can be used to load some solr modules along
       with their external dependencies.
    -->
  <lib dir="${solr.install.dir:../../../..}/modules/extraction/lib" regex=".*\.jar" />

  <lib dir="${solr.install.dir:../../../..}/modules/clustering/lib/" regex=".*\.jar" />

  <lib dir="${solr.install.dir:../../../..}/modules/langid/lib/" regex=".*\.jar" />

  <lib dir="${solr.install.dir:../../../..}/modules/ltr/lib/" regex=".*\.jar" />

  <lib dir="${solr.install.dir:../../../..}/modules/scripting/lib/" regex=".*\.jar" />

  <!-- an exact 'path' can be used instead of a 'dir' to specify a
       specific jar file.  This will cause a serious error to be logged
       if it can't be loaded.
    -->
  <!--
     <lib path="../a-jar-that-does-not-exist.jar" />
  -->

  <!-- Data Directory

       Used to specify an alternate directory to hold all index data
       other than the default ./data under the Solr home.  If
       replication is in use, this should match the replication
       configuration.
    -->
  <dataDir>${solr.data.dir:}</dataDir>


  <!-- The DirectoryFactory to use for indexes.

       solr.StandardDirectoryFactory is filesystem
       based and tries to pick the best implementation for the current
       JVM and platform.  solr.NRTCachingDirectoryFactory, the default,
       wraps solr.StandardDirectoryFactory and caches small files in memory
       for better NRT performance.

       One can force a particular implementation via solr.MMapDirectoryFactory
       or solr.NIOFSDirectoryFactory.

       solr.RAMDirectoryFactory is memory based and not persistent.
    -->
  <directoryFactory name="DirectoryFactory"
                    class="${solr.directoryFactory:solr.NRTCachingDirectoryFactory}"/>

  <!-- The CodecFactory for defining the format of the inverted index.
       The default implementation is SchemaCodecFactory, which is the official Lucene
       index format, but hooks into the schema to provide per-field customization of
       the postings lists and per-document values in the fieldType element
       (postingsFormat/docValuesFormat). Note that most of the alternative implementations
       are experimental, so if you choose to customize the index format, it's a good
       idea to convert back to the official format e.g. via IndexWriter.addIndexes(IndexReader)
       before upgrading to a newer version to avoid unnecessary reindexing.
       A "compressionMode" string element can be added to <codecFactory> to choose
       between the existing compression modes in the default codec: "BEST_SPEED" (default)
       or "BEST_COMPRESSION".
  -->
  <codecFactory class="solr.SchemaCodecFactory"/>

  <schemaFactory class="ClassicIndexSchemaFactory" />  

  <!-- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
       Index Config - These settings control low-level behavior of indexing
       Most example settings here show the default value, but are commented
       out, to more easily see where customizations have been made.

       Note: This replaces <indexDefaults> and <mainIndex> from older versions
       ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ -->
  <indexConfig>
    <!-- maxFieldLength was removed in 4.0. To get similar behavior, include a
         LimitTokenCountFilterFactory in your fieldType definition. E.g.
     <filter class="solr.LimitTokenCountFilterFactory" maxTokenCount="10000"/>
    -->
    <!-- Maximum time to wait for a write lock (ms) for an IndexWriter. Default: 1000 -->
    <!-- <writeLockTimeout>1000</writeLockTimeout>  -->

    <!-- Expert: Enabling compound file will use less files for the index,
         using fewer file descriptors on the expense of performance decrease.
         Default in Lucene is "true". Default in Solr is "false" (since 3.6) -->
    <!-- <useCompoundFile>false</useCompoundFile> -->

    <!-- ramBufferSizeMB sets the amount of RAM that may be used by Lucene
         indexing for buffering added documents and deletions before they are
         flushed to the Directory.
         maxBufferedDocs sets a limit on the number of documents buffered
         before flushing.
         If both ramBufferSizeMB and maxBufferedDocs is set, then
         Lucene will flush based on whichever limit is hit first.
         The default is 100 MB.  -->
    <!-- <ramBufferSizeMB>100</ramBufferSizeMB> -->
    <!-- <maxBufferedDocs>1000</maxBufferedDocs> -->

    <!-- Expert: ramPerThreadHardLimitMB sets the maximum amount of RAM that can be consumed
         per thread before they are flushed. When limit is exceeded, this triggers a forced
         flush even if ramBufferSizeMB has not been exceeded.
         This is a safety limit to prevent Lucene's DocumentsWriterPerThread from address space
         exhaustion due to its internal 32 bit signed integer based memory addressing.
         The specified value should be greater than 0 and less than 2048MB. When not specified,
         Solr uses Lucene's default value 1945. -->
    <!-- <ramPerThreadHardLimitMB>1945</ramPerThreadHardLimitMB> -->

    <!-- Expert: Merge Policy
         The Merge Policy in Lucene controls how merging of segments is done.
         The default since Solr/Lucene 3.3 is TieredMergePolicy.
         The default since Lucene 2.3 was the LogByteSizeMergePolicy,
         Even older versions of Lucene used LogDocMergePolicy.
      -->
    <!--
        <mergePolicyFactory class="org.apache.solr.index.TieredMergePolicyFactory">
          <int name="maxMergeAtOnce">10</int>
          <int name="segmentsPerTier">10</int>
          <double name="noCFSRatio">0.1</double>
        </mergePolicyFactory>
      -->

    <!-- Expert: Merge Scheduler
         The Merge Scheduler in Lucene controls how merges are
         performed.  The ConcurrentMergeScheduler (Lucene 2.3 default)
         can perform merges in the background using separate threads.
         The SerialMergeScheduler (Lucene 2.2 default) does not.
     -->
    <!--
       <mergeScheduler class="org.apache.lucene.index.ConcurrentMergeScheduler"/>
       -->

    <!-- LockFactory

         This option specifies which Lucene LockFactory implementation
         to use.

         single = SingleInstanceLockFactory - suggested for a
                  read-only index or when there is no possibility of
                  another process trying to modify the index.
         native = NativeFSLockFactory - uses OS native file locking.
                  Do not use when multiple solr webapps in the same
                  JVM are attempting to share a single index.
         simple = SimpleFSLockFactory  - uses a plain file for locking

         Defaults: 'native' is default for Solr3.6 and later, otherwise
                   'simple' is the default

         More details on the nuances of each LockFactory...
         https://cwiki.apache.org/confluence/display/lucene/AvailableLockFactories
    -->
    <lockType>${solr.lock.type:native}</lockType>

    <!-- Commit Deletion Policy
         Custom deletion policies can be specified here. The class must
         implement org.apache.lucene.index.IndexDeletionPolicy.

         The default Solr IndexDeletionPolicy implementation supports
         deleting index commit points on number of commits, age of
         commit point and optimized status.

         The latest commit point should always be preserved regardless
         of the criteria.
    -->
    <!--
    <deletionPolicy class="solr.SolrDeletionPolicy">
    -->
      <!-- The number of commit points to be kept -->
      <!-- <str name="maxCommitsToKeep">1</str> -->
      <!-- The number of optimized commit points to be kept -->
      <!-- <str name="maxOptimizedCommitsToKeep">0</str> -->
      <!--
          Delete all commit points once they have reached the given age.
          Supports DateMathParser syntax e.g.
        -->
      <!--
         <str name="maxCommitAge">30MINUTES</str>
         <str name="maxCommitAge">1DAY</str>
      -->
    <!--
    </deletionPolicy>
    -->

    <!-- Lucene Infostream

         To aid in advanced debugging, Lucene provides an "InfoStream"
         of detailed information when indexing.

         Setting the value to true will instruct the underlying Lucene
         IndexWriter to write its info stream to solr's log. By default,
         this is enabled here, and controlled through log4j2.xml
      -->
     <infoStream>true</infoStream>
  </indexConfig>

  <!-- The default high-performance update handler -->
  <updateHandler class="solr.DirectUpdateHandler2">

    <!-- Enables a transaction log, used for real-time get, durability, and
         and solr cloud replica recovery.  The log can grow as big as
         uncommitted changes to the index, so use of a hard autoCommit
         is recommended (see below).
         "dir" - the target directory for transaction logs, defaults to the
                solr data directory.
         "numVersionBuckets" - sets the number of buckets used to keep
                track of max version values when checking for re-ordered
                updates; increase this value to reduce the cost of
                synchronizing access to version buckets during high-volume
                indexing, this requires 8 bytes (long) * numVersionBuckets
                of heap space per Solr core.
    -->
    <updateLog>
      <str name="dir">${solr.ulog.dir:}</str>
      <int name="numVersionBuckets">${solr.ulog.numVersionBuckets:65536}</int>
    </updateLog>

    <!-- AutoCommit

         Perform a hard commit automatically under certain conditions.
         Instead of enabling autoCommit, consider using "commitWithin"
         when adding documents.

         https://solr.apache.org/guide/indexing-with-update-handlers.html

         maxDocs - Maximum number of documents to add since the last
                   commit before automatically triggering a new commit.

         maxTime - Maximum amount of time in ms that is allowed to pass
                   since a document was added before automatically
                   triggering a new commit.
         openSearcher - if false, the commit causes recent index changes
           to be flushed to stable storage, but does not cause a new
           searcher to be opened to make those changes visible.

         If the updateLog is enabled, then it's highly recommended to
         have some sort of hard autoCommit to limit the log size.
      -->
     <autoCommit>
       <maxTime>${solr.autoCommit.maxTime:15000}</maxTime>
       <openSearcher>false</openSearcher>
     </autoCommit>

    <!-- softAutoCommit is like autoCommit except it causes a
         'soft' commit which only ensures that changes are visible
         but does not ensure that data is synced to disk.  This is
         faster and more near-realtime friendly than a hard commit.
      -->

     <autoSoftCommit>
       <maxTime>${solr.autoSoftCommit.maxTime:-1}</maxTime>
     </autoSoftCommit>

    <!-- Update Related Event Listeners

         Various IndexWriter related events can trigger Listeners to
         take actions.

         postCommit - fired after every commit or optimize command
         postOptimize - fired after every optimize command
      -->

  </updateHandler>

  <!-- IndexReaderFactory

       Use the following format to specify a custom IndexReaderFactory,
       which allows for alternate IndexReader implementations.

       ** Experimental Feature **

       Please note - Using a custom IndexReaderFactory may prevent
       certain other features from working. The API to
       IndexReaderFactory may change without warning or may even be
       removed from future releases if the problems cannot be
       resolved.


       ** Features that may not work with custom IndexReaderFactory **

       The ReplicationHandler assumes a disk-resident index. Using a
       custom IndexReader implementation may cause incompatibility
       with ReplicationHandler and may cause replication to not work
       correctly. See SOLR-1366 for details.

    -->
  <!--
  <indexReaderFactory name="IndexReaderFactory" class="package.class">
    <str name="someArg">Some Value</str>
  </indexReaderFactory >
  -->

  <!-- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
       Query section - these settings control query time things like caches
       ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ -->
  <query>

    <!-- Maximum number of clauses allowed when parsing a boolean query string.

         This limit only impacts boolean queries specified by a user as part of a query string,
         and provides per-collection controls on how complex user specified boolean queries can
         be.  Query strings that specify more clauses then this will result in an error.

         If this per-collection limit is greater then the global `maxBooleanClauses` limit
         specified in `solr.xml`, it will have no effect, as that setting also limits the size
         of user specified boolean queries.
      -->
    <maxBooleanClauses>${solr.max.booleanClauses:1024}</maxBooleanClauses>


    <!-- Slow Query Threshold (in millis)

         At high request rates, logging all requests can become a bottleneck
         and therefore INFO logging is often turned off. However, it is still
         useful to be able to set a latency threshold above which a request
         is considered "slow" and log that request at WARN level so we can
         easily identify slow queries.
    -->
    <slowQueryThresholdMillis>-1</slowQueryThresholdMillis>


    <!-- Solr Internal Query Caches
         Starting with Solr 9.0 the default cache implementation used is CaffeineCache.
    -->

    <!-- Filter Cache

         Cache used by SolrIndexSearcher for filters (DocSets),
         unordered sets of *all* documents that match a query.  When a
         new searcher is opened, its caches may be prepopulated or
         "autowarmed" using data from caches in the old searcher.
         autowarmCount is the number of items to prepopulate.

         Parameters:
           class - the SolrCache implementation
           size - the maximum number of entries in the cache
           initialSize - the initial capacity (number of entries) of
               the cache.  (see java.util.HashMap)
           autowarmCount - the number of entries to prepopulate from
               an old cache.
           maxRamMB - the maximum amount of RAM (in MB) that this cache is allowed
                      to occupy. Note that when this option is specified, the size
                      and initialSize parameters are ignored.
      -->
    <filterCache size="512"
                 initialSize="512"
                 autowarmCount="0"/>

    <!-- Query Result Cache

        Caches results of searches - ordered lists of document ids
        (DocList) based on a query, a sort, and the range of documents requested.
        Additional supported parameter by CaffeineCache:
           maxRamMB - the maximum amount of RAM (in MB) that this cache is allowed
                      to occupy
     -->
    <queryResultCache size="512"
                     initialSize="512"
                     autowarmCount="0"/>

    <!-- Document Cache

         Caches Lucene Document objects (the stored fields for each
         document).  Since Lucene internal document ids are transient,
         this cache will not be autowarmed.
      -->
    <documentCache size="512"
                   initialSize="512"
                   autowarmCount="0"/>

    <!-- custom cache currently used by block join -->
    <cache name="perSegFilter"
      class="solr.CaffeineCache"
      size="10"
      initialSize="0"
      autowarmCount="10"
      regenerator="solr.NoOpRegenerator" />

    <!-- Field Value Cache

         Cache used to hold field values that are quickly accessible
         by document id.  The fieldValueCache is created by default
         even if not configured here.
      -->
    <!--
       <fieldValueCache size="512"
                        autowarmCount="128"
                        showItems="32" />
      -->

    <!-- Feature Values Cache

         Cache used by the Learning To Rank (LTR) module.

         You will need to set the solr.ltr.enabled system property
         when running solr to run with ltr enabled:
           -Dsolr.ltr.enabled=true

         https://solr.apache.org/guide/learning-to-rank.html
      -->
    <cache enable="${solr.ltr.enabled:false}" name="QUERY_DOC_FV"
           class="solr.CaffeineCache"
           size="4096"
           initialSize="2048"
           autowarmCount="4096"
           regenerator="solr.search.NoOpRegenerator" />

    <!-- Custom Cache

         Example of a generic cache.  These caches may be accessed by
         name through SolrIndexSearcher.getCache(),cacheLookup(), and
         cacheInsert().  The purpose is to enable easy caching of
         user/application level data.  The regenerator argument should
         be specified as an implementation of solr.CacheRegenerator
         if autowarming is desired.
      -->
    <!--
       <cache name="myUserCache"
              class="solr.CaffeineCache"
              size="4096"
              initialSize="1024"
              autowarmCount="1024"
              regenerator="com.mycompany.MyRegenerator"
              />
      -->


    <!-- Lazy Field Loading

         If true, stored fields that are not requested will be loaded
         lazily.  This can result in a significant speed improvement
         if the usual case is to not load all stored fields,
         especially if the skipped fields are large compressed text
         fields.
    -->
    <enableLazyFieldLoading>true</enableLazyFieldLoading>

   <!-- Use Filter For Sorted Query

        A possible optimization that attempts to use a filter to
        satisfy a search.  If the requested sort does not include
        score, then the filterCache will be checked for a filter
        matching the query. If found, the filter will be used as the
        source of document ids, and then the sort will be applied to
        that.

        For most situations, this will not be useful unless you
        frequently get the same search repeatedly with different sort
        options, and none of them ever use "score"
     -->
   <!--
      <useFilterForSortedQuery>true</useFilterForSortedQuery>
     -->

   <!-- Result Window Size

        An optimization for use with the queryResultCache.  When a search
        is requested, a superset of the requested number of document ids
        are collected.  For example, if a search for a particular query
        requests matching documents 10 through 19, and queryWindowSize is 50,
        then documents 0 through 49 will be collected and cached.  Any further
        requests in that range can be satisfied via the cache.
     -->
   <queryResultWindowSize>20</queryResultWindowSize>

   <!-- Maximum number of documents to cache for any entry in the
        queryResultCache.
     -->
   <queryResultMaxDocsCached>200</queryResultMaxDocsCached>

   <!-- Query Related Event Listeners

        Various IndexSearcher related events can trigger Listeners to
        take actions.

        newSearcher - fired whenever a new searcher is being prepared
        and there is a current searcher handling requests (aka
        registered).  It can be used to prime certain caches to
        prevent long request times for certain requests.

        firstSearcher - fired whenever a new searcher is being
        prepared but there is no current registered searcher to handle
        requests or to gain autowarming data from.


     -->
    <!-- QuerySenderListener takes an array of NamedList and executes a
         local query request for each NamedList in sequence.
      -->
    <listener event="newSearcher" class="solr.QuerySenderListener">
      <arr name="queries">
        <!--
           <lst><str name="q">solr</str><str name="sort">price asc</str></lst>
           <lst><str name="q">rocks</str><str name="sort">weight asc</str></lst>
          -->
      </arr>
    </listener>
    <listener event="firstSearcher" class="solr.QuerySenderListener">
      <arr name="queries">
        <lst>
          <str name="q">static firstSearcher warming in solrconfig.xml</str>
        </lst>
      </arr>
    </listener>

    <!-- Use Cold Searcher

         If a search request comes in and there is no current
         registered searcher, then immediately register the still
         warming searcher and use it.  If "false" then all requests
         will block until the first searcher is done warming.
      -->
    <useColdSearcher>false</useColdSearcher>

  </query>

  <!-- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     Circuit Breaker Section - This section consists of configurations for
     circuit breakers
     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ -->
  <!--<circuitBreaker>-->
    <!-- Enable Circuit Breakers

     Circuit breakers are designed to allow stability and predictable query
     execution. They prevent operations that can take down the node and cause
     noisy neighbour issues.

     This flag is the uber control switch which controls the activation/deactivation of all circuit
     breakers. At the moment, the only circuit breaker (max JVM circuit breaker) does not have its
     own specific configuration. However, if a circuit breaker wishes to be independently configurable,
     they are free to add their specific configuration but need to ensure that this flag is always
     respected - this should have veto over all independent configuration flags.
    -->
    <!--
   <useCircuitBreakers>true</useCircuitBreakers>
    -->

    <!-- Memory Circuit Breaker Threshold In Percentage

     Specific configuration for max JVM heap usage circuit breaker. This configuration defines the
     threshold percentage of maximum heap allocated beyond which queries will be rejected until the
     current JVM usage goes below the threshold. The valid value for this range is 50-95.

     Consider a scenario where the max heap allocated is 4 GB and memoryCircuitBreakerThresholdPct is
     defined as 75. Threshold JVM usage will be 4 * 0.75 = 3 GB. Its generally a good idea to keep this value between 75 - 80% of maximum heap
     allocated.

     If, at any point, the current JVM heap usage goes above 3 GB, queries will be rejected until the heap usage goes below 3 GB again.
     If you see queries getting rejected with 503 error code, check for "Circuit Breakers tripped"
     in logs and the corresponding error message should tell you what transpired (if the failure
     was caused by tripped circuit breakers).
    -->
    <!--
   <memoryCircuitBreakerThresholdPct>100</memoryCircuitBreakerThresholdPct>
    -->

  <!--</circuitBreaker>-->


  <!-- Request Dispatcher

       This section contains instructions for how the SolrDispatchFilter
       should behave when processing requests for this SolrCore.

    -->
  <requestDispatcher>
    <!-- Request Parsing

         These settings indicate how Solr Requests may be parsed, and
         what restrictions may be placed on the ContentStreams from
         those requests

         enableRemoteStreaming - enables use of the stream.file
         and stream.url parameters for specifying remote streams.

         enableStreamBody - This attribute controls whether streaming
         content from the HTTP parameter stream.body is allowed.

         multipartUploadLimitInKB - specifies the max size (in KiB) of
         Multipart File Uploads that Solr will allow in a Request.

         formdataUploadLimitInKB - specifies the max size (in KiB) of
         form data (application/x-www-form-urlencoded) sent via
         POST. You can use POST to pass request parameters not
         fitting into the URL.

         addHttpRequestToContext - if set to true, it will instruct
         the requestParsers to include the original HttpServletRequest
         object in the context map of the SolrQueryRequest under the
         key "httpRequest". It will not be used by any of the existing
         Solr components, but may be useful when developing custom
         plugins.

         *** WARNING ***
         Before enabling remote streaming, you should make sure your
         system has authentication enabled.
       -->
    <requestParsers enableRemoteStreaming="true"
                    enableStreamBody="true"
                    multipartUploadLimitInKB="-1"
                    formdataUploadLimitInKB="-1"
                    addHttpRequestToContext="false"/>

    <!-- HTTP Caching

         Set HTTP caching related parameters (for proxy caches and clients).

         The options below instruct Solr not to output any HTTP Caching
         related headers
      -->
    <httpCaching never304="true" />
    <!-- If you include a <cacheControl> directive, it will be used to
         generate a Cache-Control header (as well as an Expires header
         if the value contains "max-age=")

         By default, no Cache-Control header is generated.

         You can use the <cacheControl> option even if you have set
         never304="true"
      -->
    <!--
       <httpCaching never304="true" >
         <cacheControl>max-age=30, public</cacheControl>
       </httpCaching>
      -->
    <!-- To enable Solr to respond with automatically generated HTTP
         Caching headers, and to response to Cache Validation requests
         correctly, set the value of never304="false"

         This will cause Solr to generate Last-Modified and ETag
         headers based on the properties of the Index.

         The following options can also be specified to affect the
         values of these headers...

         lastModFrom - the default value is "openTime" which means the
         Last-Modified value (and validation against If-Modified-Since
         requests) will all be relative to when the current Searcher
         was opened.  You can change it to lastModFrom="dirLastMod" if
         you want the value to exactly correspond to when the physical
         index was last modified.

         etagSeed="..." is an option you can change to force the ETag
         header (and validation against If-None-Match requests) to be
         different even if the index has not changed (ie: when making
         significant changes to your config file)

         (lastModifiedFrom and etagSeed are both ignored if you use
         the never304="true" option)
      -->
    <!--
       <httpCaching lastModifiedFrom="openTime"
                    etagSeed="Solr">
         <cacheControl>max-age=30, public</cacheControl>
       </httpCaching>
      -->
  </requestDispatcher>

  <!-- Request Handlers

       https://solr.apache.org/guide/requesthandlers-and-searchcomponents-in-solrconfig.html

       Incoming queries will be dispatched to a specific handler by name based on the path specified in the request.

       All handlers (Search Handlers, Update Request Handlers, and other specialized types) can have default parameters (defaults, appends and invariants).

       Search Handlers can also (append, prepend or even replace) default or defined Search Components.

       Update Request Handlers can leverage Update Request Processors to pre-process documents after they are loaded
       and before they are indexed/stored.

       Not all Request Handlers are defined in the solrconfig.xml, many are implicit.
    -->

  <!-- Primary search handler, expected by most clients, examples and UI frameworks -->
  <requestHandler name="/select" class="solr.SearchHandler">
     <lst name="defaults">
       <str name="echoParams">explicit</str>
       <int name="rows">10</int>
       <str name="archived">-archived:true</str>
     </lst>
    <!-- "appends" example to ensure only products in stock are returned when using this Search Handler -->
    <!--
       <lst name="appends">
         <str name="fq">inStock:true</str>
       </lst>
      -->
     <lst name="appends">
         <str name="fq">{!v=$archived}</str>
     </lst>
    <!-- "invariants" example that will completely lock down the facets fields and queries if the facets are turned on -->
    <!--
       <lst name="invariants">
         <str name="facet.field">cat</str>
         <str name="facet.field">manu_exact</str>
         <str name="facet.query">price:[* TO 500]</str>
         <str name="facet.query">price:[500 TO *]</str>
       </lst>
      -->
    </requestHandler>

  <!-- A request handler that returns indented JSON by default -->
  <requestHandler name="/query" class="solr.SearchHandler">
     <lst name="defaults">
       <str name="echoParams">explicit</str>
       <str name="wt">json</str>
       <str name="indent">true</str>
       <str name="df">text</str>
     </lst>
  </requestHandler>

  <initParams path="/update/**,/query,/select,/tvrh,/elevate,/spell,update">
    <lst name="defaults">
      <str name="df">text</str>
    </lst>
  </initParams>

  <!-- The following are some of the implicit Update Request Handlers
  <requestHandler name="/update/json" class="solr.UpdateRequestHandler">
        <lst name="invariants">
         <str name="stream.contentType">application/json</str>
       </lst>
  </requestHandler>
  <requestHandler name="/update/csv" class="solr.UpdateRequestHandler">
        <lst name="invariants">
         <str name="stream.contentType">application/csv</str>
       </lst>
  </requestHandler>
  -->

  <!-- Solr Cell Update Request Handler

       https://solr.apache.org/guide/indexing-with-tika.html

    -->
  <requestHandler name="/update/extract"
                  startup="lazy"
                  class="solr.extraction.ExtractingRequestHandler" >
    <lst name="defaults">
      <str name="lowernames">true</str>
      <str name="uprefix">ignored_</str>

      <!-- capture link hrefs but ignore div attributes -->
      <str name="captureAttr">true</str>
      <str name="fmap.a">links</str>
      <str name="fmap.div">ignored_</str>
    </lst>
  </requestHandler>

  <!-- XSLT Update Request Handler

       https://solr.apache.org/guide/indexing-with-update-handlers.html#using-xslt-to-transform-xml-index-updates

    -->
  <requestHandler name="/update/xslt"
                  startup="lazy"
                  class="solr.scripting.xslt.XSLTUpdateRequestHandler" >
    <int name="xsltCacheLifetimeSeconds">5</int>
  </requestHandler>

   <!-- Spell Check

        The spell check component can return a list of alternative spelling
        suggestions.

        https://solr.apache.org/guide/spell-checking.html
     -->
  <searchComponent name="spellcheck" class="solr.SpellCheckComponent">

    <str name="queryAnalyzerFieldType">text_general</str>

    <!-- Multiple "Spell Checkers" can be declared and used by this
         component
      -->

    <!-- a spellchecker built from a field of the main index -->
    <lst name="spellchecker">
      <str name="name">default</str>
      <str name="field">text</str>
      <str name="classname">solr.DirectSolrSpellChecker</str>
      <!-- the spellcheck distance measure used, the default is the internal levenshtein -->
      <str name="distanceMeasure">internal</str>
      <!-- minimum accuracy needed to be considered a valid spellcheck suggestion -->
      <float name="accuracy">0.5</float>
      <!-- the maximum #edits we consider when enumerating terms: can be 1 or 2 -->
      <int name="maxEdits">2</int>
      <!-- the minimum shared prefix when enumerating terms -->
      <int name="minPrefix">1</int>
      <!-- maximum number of inspections per result. -->
      <int name="maxInspections">5</int>
      <!-- minimum length of a query term to be considered for correction -->
      <int name="minQueryLength">4</int>
      <!-- maximum threshold of documents a query term can appear to be considered for correction -->
      <float name="maxQueryFrequency">0.01</float>
      <!-- uncomment this to require suggestions to occur in 1% of the documents
        <float name="thresholdTokenFrequency">.01</float>
      -->
    </lst>

    <!-- a spellchecker that can break or combine words.  See "/spell" handler below for usage -->
    <lst name="spellchecker">
      <str name="name">wordbreak</str>
      <str name="classname">solr.WordBreakSolrSpellChecker</str>
      <str name="field">name</str>
      <str name="combineWords">true</str>
      <str name="breakWords">true</str>
      <int name="maxChanges">10</int>
    </lst>

    <!-- a spellchecker that uses a different distance measure -->
    <!--
       <lst name="spellchecker">
         <str name="name">jarowinkler</str>
         <str name="field">spell</str>
         <str name="classname">solr.DirectSolrSpellChecker</str>
         <str name="distanceMeasure">
           org.apache.lucene.search.spell.JaroWinklerDistance
         </str>
       </lst>
     -->

    <!-- a spellchecker that use an alternate comparator

         comparatorClass be one of:
          1. score (default)
          2. freq (Frequency first, then score)
          3. A fully qualified class name
      -->
    <!--
       <lst name="spellchecker">
         <str name="name">freq</str>
         <str name="field">lowerfilt</str>
         <str name="classname">solr.DirectSolrSpellChecker</str>
         <str name="comparatorClass">freq</str>
      </lst>
      -->

    <!-- A spellchecker that reads the list of words from a file -->
    <!--
       <lst name="spellchecker">
         <str name="classname">solr.FileBasedSpellChecker</str>
         <str name="name">file</str>
         <str name="sourceLocation">spellings.txt</str>
         <str name="characterEncoding">UTF-8</str>
         <str name="spellcheckIndexDir">spellcheckerFile</str>
       </lst>
      -->
  </searchComponent>

  <!-- A request handler for demonstrating the spellcheck component.

       NOTE: This is purely as an example.  The whole purpose of the
       SpellCheckComponent is to hook it into the request handler that
       handles your normal user queries so that a separate request is
       not needed to get suggestions.

       IN OTHER WORDS, THERE IS REALLY GOOD CHANCE THE SETUP BELOW IS
       NOT WHAT YOU WANT FOR YOUR PRODUCTION SYSTEM!

       See https://solr.apache.org/guide/spell-checking.html for details
       on the request parameters.
    -->
  <requestHandler name="/spell" class="solr.SearchHandler" startup="lazy">
    <lst name="defaults">
      <!-- Solr will use suggestions from both the 'default' spellchecker
           and from the 'wordbreak' spellchecker and combine them.
           collations (re-written queries) can include a combination of
           corrections from both spellcheckers -->
      <str name="spellcheck.dictionary">default</str>
      <str name="spellcheck.dictionary">wordbreak</str>
      <str name="spellcheck">on</str>
      <str name="spellcheck.extendedResults">true</str>
      <str name="spellcheck.count">10</str>
      <str name="spellcheck.alternativeTermCount">5</str>
      <str name="spellcheck.maxResultsForSuggest">5</str>
      <str name="spellcheck.collate">true</str>
      <str name="spellcheck.collateExtendedResults">true</str>
      <str name="spellcheck.maxCollationTries">10</str>
      <str name="spellcheck.maxCollations">5</str>
    </lst>
    <arr name="last-components">
      <str>spellcheck</str>
    </arr>
  </requestHandler>

  <!-- The SuggestComponent in Solr provides users with automatic suggestions for query terms.
       You can use this to implement a powerful auto-suggest feature in your search application.
       As with the rest of this solrconfig.xml file, the configuration of this component is purely
       an example that applies specifically to this configset and example documents.

       See: https://solr.apache.org/guide/suggester.html
    -->
  <searchComponent name="suggest" class="solr.SuggestComponent">
    <lst name="suggester">
      <str name="name">mySuggester</str>
      <str name="lookupImpl">FuzzyLookupFactory</str>
      <str name="dictionaryImpl">DocumentDictionaryFactory</str>
      <str name="field">cat</str>
      <str name="weightField">price</str>
      <str name="suggestAnalyzerFieldType">string</str>
      <str name="buildOnStartup">false</str>
    </lst>
  </searchComponent>

  <requestHandler name="/suggest" class="solr.SearchHandler"
                  startup="lazy" >
    <lst name="defaults">
      <str name="suggest">true</str>
      <str name="suggest.count">10</str>
    </lst>
    <arr name="components">
      <str>suggest</str>
    </arr>
  </requestHandler>


  <!-- Term Vector Component

       https://solr.apache.org/guide/the-term-vector-component.html
    -->
  <searchComponent name="tvComponent" class="solr.TermVectorComponent"/>

  <!-- A request handler for demonstrating the term vector component

       This is purely as an example.

       In reality you will likely want to add the component to your
       already specified request handlers.
    -->
  <requestHandler name="/tvrh" class="solr.SearchHandler" startup="lazy">
    <lst name="defaults">
      <bool name="tv">true</bool>
    </lst>
    <arr name="last-components">
      <str>tvComponent</str>
    </arr>
  </requestHandler>

  <!-- Search results clustering component

       You'll need to set the solr.clustering.enabled system property
       when running solr to run with clustering enabled:
       -Dsolr.clustering.enabled=true

       https://solr.apache.org/guide/result-clustering.html
    -->
  <searchComponent name="clustering"
                   enable="${solr.clustering.enabled:false}"
                   class="solr.clustering.ClusteringComponent" >
    <!--
    Declaration of "engines" (named sets of configuration parameters).

    Various algorithms are available (names are loaded via service provider
    extension point). The open source algorithms from Carrot2.org project:
      * Lingo
      * STC
      * Bisecting K-Means

    Commercial algorithm Lingo3G from Carrot Search (needs to be installed separately):
      * Lingo3G
    -->

    <lst name="engine">
      <str name="name">lingo3g</str>
      <bool name="optional">true</bool>
      <str name="clustering.algorithm">Lingo3G</str>
      <str name="clustering.fields">name, features</str>
      <bool name="clustering.includeOtherTopics">true</bool>
      <str name="clustering.language">English</str>
    </lst>

    <lst name="engine">
      <str name="name">lingo</str>
      <str name="clustering.algorithm">Lingo</str>
      <str name="clustering.fields">name, features</str>
      <bool name="clustering.includeOtherTopics">true</bool>
      <str name="clustering.language">English</str>
    </lst>

    <lst name="engine">
      <str name="name">stc</str>
      <str name="clustering.algorithm">STC</str>
      <str name="clustering.fields">name, features</str>
      <bool name="clustering.includeOtherTopics">true</bool>
      <str name="clustering.language">English</str>
    </lst>

    <lst name="engine">
      <str name="name">kmeans</str>
      <str name="clustering.algorithm">Bisecting K-Means</str>
      <str name="clustering.fields">name, features</str>
      <bool name="clustering.includeOtherTopics">true</bool>
      <str name="clustering.language">English</str>
    </lst>
  </searchComponent>

  <!-- A request handler for demonstrating the clustering component.
       This is meant as an example - in reality you will likely want
       to add the clustering component to your default request handler.
    -->
  <requestHandler name="/clustering"
                  startup="lazy"
                  enable="${solr.clustering.enabled:false}"
                  class="solr.SearchHandler">
    <lst name="defaults">
      <!-- Enable clustering component by default. -->
      <bool name="clustering">true</bool>

      <str name="defType">edismax</str>
      <str name="qf">
        text^0.5 features^1.0 name^1.2 sku^1.5 id^10.0 manu^1.1 cat^1.4
      </str>
      <str name="q.alt">*:*</str>
      <str name="rows">100</str>
      <str name="fl">*,score</str>
    </lst>

    <!-- Append the clustering component at the end of the search handler's list of components. -->
    <arr name="last-components">
      <str>clustering</str>
    </arr>
  </requestHandler>


  <!-- Query Elevation Component

       https://solr.apache.org/guide/query-elevation-component.html

       a search component that enables you to configure the top
       results for a given query regardless of the normal lucene
       scoring.
    -->
  <searchComponent name="elevator" class="solr.QueryElevationComponent" >
    <!-- pick a fieldType to analyze queries -->
    <str name="queryFieldType">string</str>
    <str name="config-file">elevate.xml</str>
  </searchComponent>

  <!-- A request handler for demonstrating the elevator component -->
  <requestHandler name="/elevate" class="solr.SearchHandler" startup="lazy">
    <lst name="defaults">
      <str name="echoParams">explicit</str>
    </lst>
    <arr name="last-components">
      <str>elevator</str>
    </arr>
  </requestHandler>

  <!-- Highlighting Component

       https://solr.apache.org/guide/highlighting.html
    -->
  <searchComponent class="solr.HighlightComponent" name="highlight">
    <!-- note: the hl.method=unified highlighter is not configured here; it's completely configured
via parameters.  The below configuration supports hl.method=original and fastVector. -->
    <highlighting>
      <!-- Configure the standard fragmenter -->
      <!-- This could most likely be commented out in the "default" case -->
      <fragmenter name="gap"
                  default="true"
                  class="solr.highlight.GapFragmenter">
        <lst name="defaults">
          <int name="hl.fragsize">100</int>
        </lst>
      </fragmenter>

      <!-- A regular-expression-based fragmenter
           (for sentence extraction)
        -->
      <fragmenter name="regex"
                  class="solr.highlight.RegexFragmenter">
        <lst name="defaults">
          <!-- slightly smaller fragsizes work better because of slop -->
          <int name="hl.fragsize">70</int>
          <!-- allow 50% slop on fragment sizes -->
          <float name="hl.regex.slop">0.5</float>
          <!-- a basic sentence pattern -->
          <str name="hl.regex.pattern">[-\w ,/\n\&quot;&apos;]{20,200}</str>
        </lst>
      </fragmenter>

      <!-- Configure the standard formatter -->
      <formatter name="html"
                 default="true"
                 class="solr.highlight.HtmlFormatter">
        <lst name="defaults">
          <str name="hl.simple.pre"><![CDATA[<em>]]></str>
          <str name="hl.simple.post"><![CDATA[</em>]]></str>
        </lst>
      </formatter>

      <!-- Configure the standard encoder -->
      <encoder name="html"
               class="solr.highlight.HtmlEncoder" />

      <!-- Configure the standard fragListBuilder -->
      <fragListBuilder name="simple"
                       class="solr.highlight.SimpleFragListBuilder"/>

      <!-- Configure the single fragListBuilder -->
      <fragListBuilder name="single"
                       class="solr.highlight.SingleFragListBuilder"/>

      <!-- Configure the weighted fragListBuilder -->
      <fragListBuilder name="weighted"
                       default="true"
                       class="solr.highlight.WeightedFragListBuilder"/>

      <!-- default tag FragmentsBuilder -->
      <fragmentsBuilder name="default"
                        default="true"
                        class="solr.highlight.ScoreOrderFragmentsBuilder">
        <!--
        <lst name="defaults">
          <str name="hl.multiValuedSeparatorChar">/</str>
        </lst>
        -->
      </fragmentsBuilder>

      <!-- multi-colored tag FragmentsBuilder -->
      <fragmentsBuilder name="colored"
                        class="solr.highlight.ScoreOrderFragmentsBuilder">
        <lst name="defaults">
          <str name="hl.tag.pre"><![CDATA[
               <b style="background:yellow">,<b style="background:lawgreen">,
               <b style="background:aquamarine">,<b style="background:magenta">,
               <b style="background:palegreen">,<b style="background:coral">,
               <b style="background:wheat">,<b style="background:khaki">,
               <b style="background:lime">,<b style="background:deepskyblue">]]></str>
          <str name="hl.tag.post"><![CDATA[</b>]]></str>
        </lst>
      </fragmentsBuilder>

      <boundaryScanner name="default"
                       default="true"
                       class="solr.highlight.SimpleBoundaryScanner">
        <lst name="defaults">
          <str name="hl.bs.maxScan">10</str>
          <str name="hl.bs.chars">.,!? &#9;&#10;&#13;</str>
        </lst>
      </boundaryScanner>

      <boundaryScanner name="breakIterator"
                       class="solr.highlight.BreakIteratorBoundaryScanner">
        <lst name="defaults">
          <!-- type should be one of CHARACTER, WORD(default), LINE and SENTENCE -->
          <str name="hl.bs.type">WORD</str>
          <!-- language and country are used when constructing Locale object.  -->
          <!-- And the Locale object will be used when getting instance of BreakIterator -->
          <str name="hl.bs.language">en</str>
          <str name="hl.bs.country">US</str>
        </lst>
      </boundaryScanner>
    </highlighting>
  </searchComponent>

  <!-- Update Request Processors
       https://solr.apache.org/guide/update-request-processors.html

       Chains or individual Update Request Processor Factories can be declared and referenced
       to preprocess documents sent to Update Request Handlers.
    -->
  <!-- Deduplication

       An example dedup update request processor chain that creates the "id" field
       on the fly based on the hash code of some other fields.  This
       example has overwriteDupes set to false since we are using the
       id field as the signatureField and Solr will maintain
       uniqueness based on that anyway.

    -->
  <!--
     <updateRequestProcessorChain name="dedupe">
       <processor class="solr.processor.SignatureUpdateProcessorFactory">
         <bool name="enabled">true</bool>
         <str name="signatureField">id</str>
         <str name="fields">name,features,cat</str>
         <str name="signatureClass">solr.processor.Lookup3Signature</str>
       </processor>
       <processor class="solr.LogUpdateProcessorFactory" />
       <processor class="solr.RunUpdateProcessorFactory" />
     </updateRequestProcessorChain>
    -->

  <!-- Language identification

       This example update request process chain identifies the language of the incoming
       documents using the langid module. The detected language is
       written to field language_s. No field name mapping is done.
       The fields used for detection are text, title, subject and description,
       making this example suitable for detecting languages form full-text
       rich documents injected via ExtractingRequestHandler.

       See more about langId at https://solr.apache.org/guide/language-detection.html
    -->
    <!--
     <updateRequestProcessorChain name="langid">
       <processor class="org.apache.solr.update.processor.TikaLanguageIdentifierUpdateProcessorFactory">
         <str name="langid.fl">text,title,subject,description</str>
         <str name="langid.langField">language_s</str>
         <str name="langid.fallback">en</str>
       </processor>
       <processor class="solr.LogUpdateProcessorFactory" />
       <processor class="solr.RunUpdateProcessorFactory" />
     </updateRequestProcessorChain>
    -->

  <!-- Script update processor

    This example hooks in an update processor implemented using JavaScript and demonstrates
    how to pass in custom parameters.

    See more about script update processor at https://solr.apache.org/guide/script-update-processor.html
  -->
  <!--
  <updateRequestProcessorChain name="script">
    <processor class="org.apache.solr.scripting.update.ScriptUpdateProcessorFactory">
      <str name="script">update-script.js</str>
      <lst name="params">
        <str name="config_param">example config parameter</str>
      </lst>
    </processor>
    <processor class="solr.RunUpdateProcessorFactory" />
  </updateRequestProcessorChain>
  -->

  <!-- Response Writers

       https://solr.apache.org/guide/response-writers.html

       Request responses will be written using the writer specified by
       the 'wt' request parameter matching the name of a registered
       writer.

       The "default" writer is the default and will be used if 'wt' is
       not specified in the request.
    -->
  <!-- The following response writers are implicitly configured unless
       overridden...
    -->
  <!--
     <queryResponseWriter name="xml"
                          default="true"
                          class="solr.XMLResponseWriter" />
     <queryResponseWriter name="json" class="solr.JSONResponseWriter"/>
     <queryResponseWriter name="python" class="solr.PythonResponseWriter"/>
     <queryResponseWriter name="ruby" class="solr.RubyResponseWriter"/>
     <queryResponseWriter name="php" class="solr.PHPResponseWriter"/>
     <queryResponseWriter name="phps" class="solr.PHPSerializedResponseWriter"/>
     <queryResponseWriter name="csv" class="solr.CSVResponseWriter"/>
     <queryResponseWriter name="schema.xml" class="solr.SchemaXmlResponseWriter"/>
    -->

  <!-- XSLT response writer transforms the XML output by any xslt file found
       in Solr's conf/xslt directory.  Changes to xslt files are checked
       every xsltCacheLifetimeSeconds.  This is part of the Scripting module.

       See more about this response writer at https://solr.apache.org/guide/response-writers.html#xslt-response-writer
  -->
  <queryResponseWriter name="xslt"
                          startup="lazy"
                          class="solr.scripting.xslt.XSLTResponseWriter">
    <int name="xsltCacheLifetimeSeconds">5</int>
  </queryResponseWriter>

  <!-- Query Parsers

       https://solr.apache.org/guide/query-syntax-and-parsing.html

       Multiple QParserPlugins can be registered by name, and then
       used in either the "defType" param for the QueryComponent (used
       by SearchHandler) or in LocalParams
    -->
  <!-- example of registering a query parser -->
  <!--
     <queryParser name="myparser" class="com.mycompany.MyQParserPlugin"/>
    -->

  <!-- Function Parsers

       https://solr.apache.org/guide/function-queries.html

       Multiple ValueSourceParsers can be registered by name, and then
       used as function names when using the "func" QParser.
    -->
  <!-- example of registering a custom function parser  -->
  <!--
     <valueSourceParser name="myfunc"
                        class="com.mycompany.MyValueSourceParser" />
    -->

  <!--  LTR query parser

        You will need to set the solr.ltr.enabled system property
        when running solr to run with ltr enabled:
          -Dsolr.ltr.enabled=true

        https://solr.apache.org/guide/learning-to-rank.html

        Query parser is used to rerank top docs with a provided model
    -->
  <queryParser enable="${solr.ltr.enabled:false}" name="ltr" class="org.apache.solr.ltr.search.LTRQParserPlugin"/>

  <!-- Document Transformers
       https://solr.apache.org/guide/document-transformers.html
    -->
  <!--
     Could be something like:
     <transformer name="db" class="com.mycompany.LoadFromDatabaseTransformer" >
       <int name="connection">jdbc://....</int>
     </transformer>

     To add a constant value to all docs, use:
     <transformer name="mytrans2" class="org.apache.solr.response.transform.ValueAugmenterFactory" >
       <int name="value">5</int>
     </transformer>

     If you want the user to still be able to change it with _value:something_ use this:
     <transformer name="mytrans3" class="org.apache.solr.response.transform.ValueAugmenterFactory" >
       <double name="defaultValue">5</double>
     </transformer>

      If you are using the QueryElevationComponent, you may wish to mark documents that get boosted.  The
      EditorialMarkerFactory will do exactly that:
     <transformer name="qecBooster" class="org.apache.solr.response.transform.EditorialMarkerFactory" />
    -->

    <!--
      LTR Transformer will encode the document features in the response. For each document the transformer
      will add the features as an extra field in the response. The name of the field will be the
      name of the transformer enclosed between brackets (in this case [features]).
      In order to get the feature vector you will have to specify that you
      want the field (e.g., fl="*,[features])

      You will need to set the solr.ltr.enabled system property
      when running solr to run with ltr enabled:
        -Dsolr.ltr.enabled=true

      https://solr.apache.org/guide/learning-to-rank.html
      -->
    <transformer enable="${solr.ltr.enabled:false}" name="features" class="org.apache.solr.ltr.response.transform.LTRFeatureLoggerTransformerFactory">
      <str name="fvCacheName">QUERY_DOC_FV</str>
    </transformer>
</config>
