solrconfig.xml

<?xml version="1.0" encoding="UTF-8" ?>

<config>

  <abortOnConfigurationError>${solr.abortOnConfigurationError:true}</abortOnConfigurationError>

    <luceneMatchVersion>4.4</luceneMatchVersion>

    <lib dir="../../contrib/extraction/lib" regex=".*\.jar" />
    <lib dir="../../dist/" regex="solr-cell-\d.*\.jar" />

    <lib dir="../../contrib/clustering/lib/" regex=".*\.jar" />
    <lib dir="../../dist/" regex="solr-clustering-\d.*\.jar" />

    <lib dir="../../contrib/langid/lib/" regex=".*\.jar" />
    <lib dir="../../dist/" regex="solr-langid-\d.*\.jar" />

    <lib dir="../../contrib/velocity/lib" regex=".*\.jar" />
    <lib dir="../../dist/" regex="solr-velocity-\d.*\.jar" />




  <!-- 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>

  <directoryFactory name="DirectoryFactory"
                    class="${solr.directoryFactory:solr.NRTCachingDirectoryFactory}"/>


   <indexConfig>
    <!-- options specific to the main on-disk lucene index -->
    <useCompoundFile>false</useCompoundFile>
    <ramBufferSizeMB>128</ramBufferSizeMB>
    <mergeFactor>10</mergeFactor>
    <!-- Deprecated -->
    <!--<maxBufferedDocs>1000</maxBufferedDocs>-->
    <!--<maxMergeDocs>2147483647</maxMergeDocs>-->

    <!-- inherit from indexDefaults <maxFieldLength>10000</maxFieldLength> -->

    <!-- If true, unlock any held write or commit locks on startup.
         This defeats the locking mechanism that allows multiple
         processes to safely access a lucene index, and should be
         used with care.
         This is not needed if lock type is 'none' or 'single'
     -->
    <unlockOnStartup>false</unlockOnStartup>

    <!-- If true, IndexReaders will be reopened (often more efficient) instead
         of closed and then opened.  -->
    <reopenReaders>true</reopenReaders>

    <!--
     Expert:
    Controls how often Lucene loads terms into memory.  Default is 128 and is likely good for most everyone. -->
    <!--<termIndexInterval>256</termIndexInterval>-->

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

        http://lucene.apache.org/java/2_3_2/api/org/apache/lucene/index/IndexDeletionPolicy.html

        The standard 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>

    <!--  To aid in advanced debugging, you may turn on IndexWriter debug logging.
      Setting to true will set the file that the underlying Lucene IndexWriter
      will write its debug infostream to.  -->
     <infoStream file="INFOSTREAM.txt">false</infoStream>

  </indexConfig>

  <!--  Enables JMX if and only if an existing MBeanServer is found, use this
    if you want to configure JMX through JVM parameters. Remove this to disable
    exposing Solr configuration and statistics to JMX.

        If you want to connect to a particular server, specify the agentId
        e.g. <jmx agentId="myAgent" />

        If you want to start a new MBeanServer, specify the serviceUrl
        e.g <jmx serviceUrl="service:jmx:rmi:///jndi/rmi://localhost:9999/solr"/>

        For more details see http://wiki.apache.org/solr/SolrJmx
  -->
  <jmx />

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

    <updateLog>
      <str name="dir">${solr.ulog.dir:}</str>
    </updateLog>

    <!-- 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)
     -->

    <!-- Perform a <commit/> automatically under certain conditions:
         maxDocs - number of updates since last commit is greater than this
         maxTime - oldest uncommited update (in ms) is this long ago
         Instead of enabling autoCommit, consider using "commitWithin"
         when adding documents. http://wiki.apache.org/solr/UpdateXmlMessages
     -->
    <autoCommit>
      <maxDocs>10000</maxDocs>
      <maxTime>10000</maxTime>
    </autoCommit>



    <!-- The RunExecutableListener executes an external command from a
      hook such as postCommit or postOptimize.
         exe - the name of the executable to run
         dir - dir to use as the current working directory. default="."
         wait - the calling thread waits until the executable returns. default="true"
         args - the arguments to pass to the program.  default=nothing
         env - environment variables to set.  default=nothing
      -->
    <!-- A postCommit event is fired after every commit or optimize command
    <listener event="postCommit" class="solr.RunExecutableListener">
      <str name="exe">solr/bin/snapshooter</str>
      <str name="dir">.</str>
      <bool name="wait">true</bool>
      <arr name="args"> <str>arg1</str> <str>arg2</str> </arr>
      <arr name="env"> <str>MYVAR=val1</str> </arr>
    </listener>
    -->
    <!-- A postOptimize event is fired only after every optimize command
    <listener event="postOptimize" class="solr.RunExecutableListener">
      <str name="exe">snapshooter</str>
      <str name="dir">solr/bin</str>
      <bool name="wait">true</bool>
    </listener>
    -->

  </updateHandler>

  <!-- Use the following format to specify a custom IndexReaderFactory - 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">
    Parameters as required by the implementation
  </indexReaderFactory >
  -->
  <!-- To set the termInfosIndexDivisor, do this: -->
  <!--<indexReaderFactory name="IndexReaderFactory" class="org.apache.solr.core.StandardIndexReaderFactory">
    <int name="termInfosIndexDivisor">12</int>
  </indexReaderFactory >-->


  <query>
    <!-- Maximum number of clauses in a boolean query... in the past, this affected
        range or prefix queries that expanded to big boolean queries - built in Solr
        query parsers no longer create queries with this limitation.
        An exception is thrown if exceeded.  -->
    <maxBooleanClauses>1024</maxBooleanClauses>


    <!-- There are two implementations of cache available for Solr,
         LRUCache, based on a synchronized LinkedHashMap, and
         FastLRUCache, based on a ConcurrentHashMap.  FastLRUCache has faster gets
         and slower puts in single threaded operation and thus is generally faster
         than LRUCache when the hit ratio of the cache is high (> 75%), and may be
         faster under other scenarios on multi-cpu systems. -->
    <!-- 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.  For LRUCache,
         the autowarmed items will be the most recently accessed items.
       Parameters:
         class - the SolrCache implementation LRUCache or FastLRUCache
         size - the maximum number of entries in the cache
         initialSize - the initial capacity (number of entries) of
           the cache.  (seel java.util.HashMap)
         autowarmCount - the number of entries to prepopulate from
           and old cache.
         -->
    <filterCache
      class="solr.FastLRUCache"
      size="512"
      initialSize="512"
      autowarmCount="0"/>

    <!-- 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
        class="solr.FastLRUCache"
        size="512"
        autowarmCount="128"
        showItems="32"
      />
    -->

   <!-- queryResultCache caches results of searches - ordered lists of
         document ids (DocList) based on a query, a sort, and the range
         of documents requested.  -->
    <queryResultCache
      class="solr.LRUCache"
      size="512"
      initialSize="512"
      autowarmCount="0"/>

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

    <!-- 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>

    <!-- 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.search.CacheRegenerator if autowarming is desired.  -->
    <!--
    <cache name="myUserCache"
      class="solr.LRUCache"
      size="4096"
      initialSize="1024"
      autowarmCount="1024"
      regenerator="org.mycompany.mypackage.MyRegenerator"
      />
    -->

   <!-- An 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.
    <useFilterForSortedQuery>true</useFilterForSortedQuery>
   -->
<useFilterForSortedQuery>true</useFilterForSortedQuery>
   <!-- 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>

    <!-- a newSearcher event is 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.
    -->
    <!-- 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="start">0</str> <str name="rows">10</str> </lst>
        <lst> <str name="q">rocks</str> <str name="start">0</str> <str name="rows">10</str> </lst>
        <lst><str name="q">static newSearcher warming query from solrconfig.xml</str></lst>
        -->
      </arr>
    </listener>

    <!-- a firstSearcher event is fired whenever a new searcher is being
         prepared but there is no current registered searcher to handle
         requests or to gain autowarming data from. -->
    <listener event="firstSearcher" class="solr.QuerySenderListener">
      <arr name="queries">
        <lst> <str name="q">solr rocks</str><str name="start">0</str><str name="rows">10</str></lst>
        <lst><str name="q">static firstSearcher warming query from solrconfig.xml</str></lst>
      </arr>
    </listener>

    <!-- 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>

    <!-- Maximum number of searchers that may be warming in the background
      concurrently.  An error is returned if this limit is exceeded. Recommend
      1-2 for read-only slaves, higher for masters w/o cache warming. -->
    <maxWarmingSearchers>2</maxWarmingSearchers>

  </query>

  <!--
    Let the dispatch filter handler /select?qt=XXX
    handleSelect=true will use consistent error handling for /select and /update
    handleSelect=false will use solr1.1 style error formatting
    -->
  <requestDispatcher handleSelect="true" >
    <!--Make sure your system has some authentication before enabling remote streaming!  -->
    <requestParsers enableRemoteStreaming="true" multipartUploadLimitInKB="2048000" />

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

         To get the behaviour of Solr 1.2 (ie: no caching related headers)
         use the never304="true" option and do not specify a value for
         <cacheControl>
    -->
    <!-- <httpCaching never304="true"> -->
    <httpCaching lastModifiedFrom="openTime"
                 etagSeed="Solr">
       <!-- lastModFrom="openTime" is the default, 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 corrispond 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
            differnet 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.
       -->
       <!-- 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"
       -->
       <!-- <cacheControl>max-age=30, public</cacheControl> -->
    </httpCaching>
  </requestDispatcher>


  <!-- requestHandler plugins... incoming queries will be dispatched to the
     correct handler based on the path or the qt (query type) param.
     Names starting with a '/' are accessed with the a path equal to the
     registered name.  Names without a leading '/' are accessed with:
      http://host/app/select?qt=name
     If no qt is defined, the requestHandler that declares default="true"
     will be used.
  -->
  <requestHandler name="standard" class="solr.SearchHandler" default="true">
    <!-- default values for query parameters -->
     <lst name="defaults">
       <str name="echoParams">explicit</str>
       <!--
       <int name="rows">10</int>
       <str name="fl">*</str>
       <str name="version">2.1</str>
        -->
     </lst>
     <arr name="last-components">
      <str>spellcheck</str>
    </arr>
  </requestHandler>

<!-- Please refer to http://wiki.apache.org/solr/SolrReplication for details on configuring replication -->
<!-- remove the <lst name="master"> section if this is just a slave -->
<!-- remove  the <lst name="slave"> section if this is just a master -->
<!--
<requestHandler name="/replication" class="solr.ReplicationHandler" >
    <lst name="master">
      <str name="replicateAfter">commit</str>
      <str name="replicateAfter">startup</str>
      <str name="confFiles">schema.xml,stopwords.txt</str>
    </lst>
    <lst name="slave">
      <str name="masterUrl">http://localhost:8983/solr/replication</str>
      <str name="pollInterval">00:00:60</str>
    </lst>
</requestHandler>-->

  <!-- DisMaxRequestHandler allows easy searching across multiple fields
       for simple user-entered phrases.  It's implementation is now
       just the standard SearchHandler with a default query type
       of "dismax".
       see http://wiki.apache.org/solr/DisMaxRequestHandler
   -->
  <requestHandler name="dismax" class="solr.SearchHandler" >
    <lst name="defaults">
     <str name="defType">dismax</str>
     <str name="echoParams">explicit</str>
     <float name="tie">0.01</float>
     <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="pf">
        text^0.2 features^1.1 name^1.5 manu^1.4 manu_exact^1.9
     </str>
     <str name="bf">
        popularity^0.5 recip(price,1,1000,1000)^0.3
     </str>
     <str name="fl">
        id,name,price,score
     </str>
     <str name="mm">
        2&lt;-1 5&lt;-2 6&lt;90%
     </str>
     <int name="ps">100</int>
     <str name="q.alt">*:*</str>
     <!-- example highlighter config, enable per-query with hl=true -->
     <str name="hl.fl">text features name</str>
     <!-- for this field, we want no fragmenting, just highlighting -->
     <str name="f.name.hl.fragsize">0</str>
     <!-- instructs Solr to return the field itself if no query terms are
          found -->
     <str name="f.name.hl.alternateField">name</str>
     <str name="f.text.hl.fragmenter">regex</str> <!-- defined below -->
    </lst>
  </requestHandler>

  <!-- Note how you can register the same handler multiple times with
       different names (and different init parameters)
    -->
  <requestHandler name="partitioned" class="solr.SearchHandler" >
    <lst name="defaults">
     <str name="defType">dismax</str>
     <str name="echoParams">explicit</str>
     <str name="qf">text^0.5 features^1.0 name^1.2 sku^1.5 id^10.0</str>
     <str name="mm">2&lt;-1 5&lt;-2 6&lt;90%</str>
     <!-- This is an example of using Date Math to specify a constantly
          moving date range in a config...
       -->
     <str name="bq">incubationdate_dt:[* TO NOW/DAY-1MONTH]^2.2</str>
    </lst>
    <!-- In addition to defaults, "appends" params can be specified
         to identify values which should be appended to the list of
         multi-val params from the query (or the existing "defaults").

         In this example, the param "fq=instock:true" will be appended to
         any query time fq params the user may specify, as a mechanism for
         partitioning the index, independent of any user selected filtering
         that may also be desired (perhaps as a result of faceted searching).

         NOTE: there is *absolutely* nothing a client can do to prevent these
         "appends" values from being used, so don't use this mechanism
         unless you are sure you always want it.
      -->
    <lst name="appends">
      <str name="fq">inStock:true</str>
    </lst>
    <!-- "invariants" are a way of letting the Solr maintainer lock down
         the options available to Solr clients.  Any params values
         specified here are used regardless of what values may be specified
         in either the query, the "defaults", or the "appends" params.

         In this example, the facet.field and facet.query params are fixed,
         limiting the facets clients can use.  Faceting is not turned on by
         default - but if the client does specify facet=true in the request,
         these are the only facets they will be able to see counts for;
         regardless of what other facet.field or facet.query params they
         may specify.

         NOTE: there is *absolutely* nothing a client can do to prevent these
         "invariants" values from being used, so don't use this mechanism
         unless you are sure you always want it.
      -->
    <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>


  <!--
   Search components are registered to SolrCore and used by Search Handlers

   By default, the following components are avaliable:

   <searchComponent name="query"     class="org.apache.solr.handler.component.QueryComponent" />
   <searchComponent name="facet"     class="org.apache.solr.handler.component.FacetComponent" />
   <searchComponent name="mlt"       class="org.apache.solr.handler.component.MoreLikeThisComponent" />
   <searchComponent name="highlight" class="org.apache.solr.handler.component.HighlightComponent" />
   <searchComponent name="stats"     class="org.apache.solr.handler.component.StatsComponent" />
   <searchComponent name="debug"     class="org.apache.solr.handler.component.DebugComponent" />

   Default configuration in a requestHandler would look like:
    <arr name="components">
      <str>query</str>
      <str>facet</str>
      <str>mlt</str>
      <str>highlight</str>
      <str>stats</str>
      <str>debug</str>
    </arr>

    If you register a searchComponent to one of the standard names, that will be used instead.
    To insert components before or after the 'standard' components, use:

    <arr name="first-components">
      <str>myFirstComponentName</str>
    </arr>

    <arr name="last-components">
      <str>myLastComponentName</str>
    </arr>
  -->

   <!-- The spell check component can return a list of alternative spelling
  suggestions.  -->
  <searchComponent name="spellcheck" class="solr.SpellCheckComponent">

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

    <lst name="spellchecker">
      <str name="name">default</str>
      <str name="field">textSpell</str>
      <str name="spellcheckIndexDir">./spellchecker</str>
      <str name="buildOnCommit">true</str>
    </lst>

    <!-- a spellchecker that uses a different distance measure
    <lst name="spellchecker">
      <str name="name">jarowinkler</str>
      <str name="field">spell</str>
      <str name="distanceMeasure">org.apache.lucene.search.spell.JaroWinklerDistance</str>
      <str name="spellcheckIndexDir">./spellchecker2</str>
    </lst>
     -->

    <!-- a file based spell checker
    <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 utilizing 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 (i.e.
  the standard or dismax SearchHandler) queries such 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!
  #############################################################################
  -->
  <requestHandler name="/spell" class="solr.SearchHandler" lazy="true">
    <lst name="defaults">
      <!-- omp = Only More Popular -->
      <str name="spellcheck.onlyMorePopular">false</str>
      <!-- exr = Extended Results -->
      <str name="spellcheck.extendedResults">false</str>
      <!--  The number of suggestions to return -->
      <str name="spellcheck.count">1</str>
    </lst>
    <arr name="last-components">
      <str>spellcheck</str>
    </arr>
  </requestHandler>

  <searchComponent name="tvComponent" class="org.apache.solr.handler.component.TermVectorComponent"/>
  <!-- A Req Handler for working with the tvComponent.  This is purely as an example.
  You will likely want to add the component to your already specified request handlers. -->
  <requestHandler name="tvrh" class="org.apache.solr.handler.component.SearchHandler">
    <lst name="defaults">
      <bool name="tv">true</bool>
    </lst>
    <arr name="last-components">
      <str>tvComponent</str>
    </arr>
  </requestHandler>

  <!-- Clustering Component
       http://wiki.apache.org/solr/ClusteringComponent
       This relies on third party jars which are not included in the release.
       To use this component (and the "/clustering" handler)
       Those jars will need to be downloaded, and you'll need to set the
       solr.cluster.enabled system property when running solr...
          java -Dsolr.clustering.enabled=true -jar start.jar
    -->
  <searchComponent
    name="clusteringComponent"
    enable="${solr.clustering.enabled:false}"
    class="org.apache.solr.handler.clustering.ClusteringComponent" >
    <!-- Declare an engine -->
    <lst name="engine">
      <!-- The name, only one can be named "default" -->
      <str name="name">default</str>
      <!--
           Class name of Carrot2 clustering algorithm. Currently available algorithms are:

           * org.carrot2.clustering.lingo.LingoClusteringAlgorithm
           * org.carrot2.clustering.stc.STCClusteringAlgorithm

           See http://project.carrot2.org/algorithms.html for the algorithm's characteristics.
        -->
      <str name="carrot.algorithm">org.carrot2.clustering.lingo.LingoClusteringAlgorithm</str>
      <!--
           Overriding values for Carrot2 default algorithm attributes. For a description
           of all available attributes, see: http://download.carrot2.org/stable/manual/#chapter.components.
           Use attribute key as name attribute of str elements below. These can be further
           overridden for individual requests by specifying attribute key as request
           parameter name and attribute value as parameter value.
        -->
      <str name="LingoClusteringAlgorithm.desiredClusterCountBase">20</str>
    </lst>
    <lst name="engine">
      <str name="name">stc</str>
      <str name="carrot.algorithm">org.carrot2.clustering.stc.STCClusteringAlgorithm</str>
    </lst>
  </searchComponent>
  <requestHandler name="/clustering"
                  enable="${solr.clustering.enabled:false}"
                  class="solr.SearchHandler">
     <lst name="defaults">
       <bool name="clustering">true</bool>
       <str name="clustering.engine">default</str>
       <bool name="clustering.results">true</bool>
       <!-- The title field -->
       <str name="carrot.title">name</str>
       <str name="carrot.url">id</str>
       <!-- The field to cluster on -->
       <str name="carrot.snippet">features</str>
       <!-- produce summaries -->
       <bool name="carrot.produceSummary">true</bool>
       <!-- the maximum number of labels per cluster -->
       <!--<int name="carrot.numDescriptions">5</int>-->
       <!-- produce sub clusters -->
       <bool name="carrot.outputSubClusters">false</bool>
    </lst>
    <arr name="last-components">
      <str>clusteringComponent</str>
    </arr>
  </requestHandler>

  <!-- Solr Cell: http://wiki.apache.org/solr/ExtractingRequestHandler -->
  <requestHandler name="/update/extract" class="org.apache.solr.handler.extraction.ExtractingRequestHandler" startup="lazy">
    <lst name="defaults">
      <!-- All the main content goes into "text"... if you need to return
           the extracted text or do highlighting, use a stored field. -->
      <str name="fmap.content">text</str>
      <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>


  <!-- A component to return terms and document frequency of those terms.
       This component does not yet support distributed search. -->
  <searchComponent name="termsComponent" class="org.apache.solr.handler.component.TermsComponent"/>

  <requestHandler name="/terms" class="org.apache.solr.handler.component.SearchHandler">
     <lst name="defaults">
      <bool name="terms">true</bool>
    </lst>
    <arr name="components">
      <str>termsComponent</str>
    </arr>
  </requestHandler>

  <!-- JSON Update Request Handler
       http://wiki.apache.org/solr/UpdateJSON
    -->
  <requestHandler name="/update/json"
                  class="solr.JsonUpdateRequestHandler"
                  startup="lazy" />


  <!-- 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 utilizing 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>


  <!-- Update request handler.

       Note: Since solr1.1 requestHandlers requires a valid content type header if posted in
       the body. For example, curl now requires: -H 'Content-type:text/xml; charset=utf-8'
       The response format differs from solr1.1 formatting and returns a standard error code.
       To enable solr1.1 behavior, remove the /update handler or change its path
    -->
  <requestHandler name="/update" class="solr.UpdateRequestHandler" />


  <requestHandler name="/update/javabin" class="solr.UpdateRequestHandler" />

  <!--
   Analysis request handler.  Since Solr 1.3.  Use to return how a document is analyzed.  Useful
   for debugging and as a token server for other types of applications.

   This is deprecated in favor of the improved DocumentAnalysisRequestHandler and FieldAnalysisRequestHandler

   <requestHandler name="/analysis" class="solr.AnalysisRequestHandler" />
   -->

  <!--
    An analysis handler that provides a breakdown of the analysis process of provided docuemnts. This handler expects a
    (single) content stream with the following format:

    <docs>
      <doc>
        <field name="id">1</field>
        <field name="name">The Name</field>
        <field name="text">The Text Value</field>
      <doc>
      <doc>...</doc>
      <doc>...</doc>
      ...
    </docs>

    Note: Each document must contain a field which serves as the unique key. This key is used in the returned
    response to assoicate an analysis breakdown to the analyzed document.

    Like the FieldAnalysisRequestHandler, this handler also supports query analysis by
    sending either an "analysis.query" or "q" request paraemter that holds the query text to be analyized. It also
    supports the "analysis.showmatch" parameter which when set to true, all field tokens that match the query
    tokens will be marked as a "match".
  -->
  <requestHandler name="/analysis/document" class="solr.DocumentAnalysisRequestHandler" />

  <!--
    RequestHandler that provides much the same functionality as analysis.jsp. Provides the ability
    to specify multiple field types and field names in the same request and outputs index-time and
    query-time analysis for each of them.

    Request parameters are:
    analysis.fieldname - The field name whose analyzers are to be used
    analysis.fieldtype - The field type whose analyzers are to be used
    analysis.fieldvalue - The text for index-time analysis
    q (or analysis.q) - The text for query time analysis
    analysis.showmatch (true|false) - When set to true and when query analysis is performed, the produced
                                      tokens of the field value analysis will be marked as "matched" for every
                                      token that is produces by the query analysis
   -->
  <requestHandler name="/analysis/field" class="solr.FieldAnalysisRequestHandler" />


  <!-- CSV update handler, loaded on demand -->
  <requestHandler name="/update/csv" class="solr.CSVRequestHandler" startup="lazy" />


  <!--
   Admin Handlers - This will register all the standard admin RequestHandlers.  Adding
   this single handler is equivalent to registering:

  <requestHandler name="/admin/luke"       class="org.apache.solr.handler.admin.LukeRequestHandler" />
  <requestHandler name="/admin/system"     class="org.apache.solr.handler.admin.SystemInfoHandler" />
  <requestHandler name="/admin/plugins"    class="org.apache.solr.handler.admin.PluginInfoHandler" />
  <requestHandler name="/admin/threads"    class="org.apache.solr.handler.admin.ThreadDumpHandler" />
  <requestHandler name="/admin/properties" class="org.apache.solr.handler.admin.PropertiesRequestHandler" />
  <requestHandler name="/admin/file"       class="org.apache.solr.handler.admin.ShowFileRequestHandler" >

  If you wish to hide files under ${solr.home}/conf, explicitly register the ShowFileRequestHandler using:
  <requestHandler name="/admin/file" class="org.apache.solr.handler.admin.ShowFileRequestHandler" >
    <lst name="invariants">
     <str name="hidden">synonyms.txt</str>
     <str name="hidden">anotherfile.txt</str>
    </lst>
  </requestHandler>
  -->
  <requestHandler name="/admin/" class="org.apache.solr.handler.admin.AdminHandlers" />

  <!-- ping/healthcheck -->
  <requestHandler name="/admin/ping" class="PingRequestHandler">
    <lst name="defaults">
      <str name="qt">standard</str>
      <str name="q">solrpingquery</str>
      <str name="echoParams">all</str>
    </lst>
  </requestHandler>

  <!-- Echo the request contents back to the client -->
  <requestHandler name="/debug/dump" class="solr.DumpRequestHandler" >
    <lst name="defaults">
     <str name="echoParams">explicit</str> <!-- for all params (including the default etc) use: 'all' -->
     <str name="echoHandler">true</str>
    </lst>
  </requestHandler>

  <highlighting>
   <!-- Configure the standard fragmenter -->
   <!-- This could most likely be commented out in the "default" case -->
   <fragmenter name="gap" class="org.apache.solr.highlight.GapFragmenter" default="true">
    <lst name="defaults">
     <int name="hl.fragsize">100</int>
    </lst>
   </fragmenter>

   <!-- A regular-expression-based fragmenter (f.i., for sentence extraction) -->
   <fragmenter name="regex" class="org.apache.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\"']{20,200}</str>
    </lst>
   </fragmenter>

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

  <!-- An example dedup update processor 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.

       You have to link the chain to an update handler above to use it ie:
         <requestHandler name="/update "class="solr.UpdateRequestHandler">
           <lst name="defaults">
             <str name="update.processor">dedupe</str>
           </lst>
         </requestHandler>
  -->
  <!--
  <updateRequestProcessorChain name="dedupe">
    <processor class="org.apache.solr.update.processor.SignatureUpdateProcessorFactory">
      <bool name="enabled">true</bool>
      <str name="signatureField">id</str>
      <bool name="overwriteDupes">false</bool>
      <str name="fields">name,features,cat</str>
      <str name="signatureClass">org.apache.solr.update.processor.Lookup3Signature</str>
    </processor>
    <processor class="solr.LogUpdateProcessorFactory" />
    <processor class="solr.RunUpdateProcessorFactory" />
  </updateRequestProcessorChain>
  -->


  <!-- Response Writers

       http://wiki.apache.org/solr/QueryResponseWriter

       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="json" class="solr.JSONResponseWriter">
     <!-- For the purposes of the tutorial, JSON responses are written as
      plain text so that they are easy to read in *any* browser.
      If you expect a MIME type of "application/json" just remove this override.
     -->
    <str name="content-type">text/plain; charset=UTF-8</str>
  </queryResponseWriter>

  <!--
     Custom response writers can be declared as needed...
    -->
    <queryResponseWriter name="velocity" class="solr.VelocityResponseWriter" startup="lazy"/>


  <!-- XSLT response writer transforms the XML output by any xslt file found
       in Solr's conf/xslt directory.  Changes to xslt files are checked for
       every xsltCacheLifetimeSeconds.
    -->
  <queryResponseWriter name="xslt" class="solr.XSLTResponseWriter">
    <int name="xsltCacheLifetimeSeconds">5</int>
  </queryResponseWriter>


  <!-- example of registering a query parser
  <queryParser name="lucene" class="org.apache.solr.search.LuceneQParserPlugin"/>
  -->

  <!-- example of registering a custom function parser
  <valueSourceParser name="myfunc" class="com.mycompany.MyValueSourceParser" />
  -->

  <!-- config for the admin interface -->
  <admin>
    <defaultQuery>solr</defaultQuery>

    <!-- configure a healthcheck file for servers behind a loadbalancer
    <healthcheck type="file">server-enabled</healthcheck>
    -->
  </admin>

</config>