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✏️ Editing: solr-config-7.7.0.xml

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

<!-- 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-contribs along
       with their external dependencies.
    -->
  <lib dir="${solr.install.dir:../../../..}/contrib/extraction/lib" regex=".*\.jar" />
  <lib dir="${solr.install.dir:../../../..}/dist/" regex="solr-cell-\d.*\.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>

<updateHandler class="solr.DirectUpdateHandler2">

<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.

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

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>

<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>

<query>
    <!-- Solr Internal Query Caches

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.
    -->

<!-- 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.  For
         LRUCache, the autowarmed items will be the most recently
         accessed items.

Parameters:
           class - the SolrCache implementation LRUCache or
               (LRUCache or FastLRUCache)
           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
               and 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 class="solr.FastLRUCache"
                 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 LRUCache:
            maxRamMB - the maximum amount of RAM (in MB) that this cache is allowed
                       to occupy
      -->
    <queryResultCache class="solr.LRUCache"
                      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 class="solr.LRUCache"
                   size="512"
                   initialSize="512"
                   autowarmCount="0"/>

<cache name="perSegFilter"
           class="solr.search.LRUCache"
           size="10"
           initialSize="0"
           autowarmCount="10"
           regenerator="solr.NoOpRegenerator" />

<!-- 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>

<!-- 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>

<queryResultMaxDocsCached>200</queryResultMaxDocsCached>

<!-- 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>

<!-- Request Dispatcher

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

-->
  <requestDispatcher>
    <httpCaching never304="true" />
  </requestDispatcher>

<!-- Request Handlers

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

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

If a Request Handler is declared with startup="lazy", then it will
       not be initialized until the first request that uses it.

-->
  <!-- SearchHandler

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

For processing Search Queries, the primary Request Handler
       provided with Solr is "SearchHandler" It delegates to a sequent
       of SearchComponents (see below) and supports distributed
       queries across multiple shards
    -->
  <requestHandler name="/select" class="solr.SearchHandler">
    
    <lst name="defaults">
      <str name="echoParams">explicit</str>
      <int name="rows">10</int>
    </lst>
  </requestHandler>

<!-- 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.
    -->
  <queryResponseWriter name="xml"
                       default="true"
                       class="solr.XMLResponseWriter" />
</config>

MR SKB