I've been using the same config since 6.x iirc.

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From: dovecot <dovecot-bounces@dovecot.org> on behalf of luckydog xf via dovecot <dovecot@dovecot.org>
Sent: Monday, April 22, 2019 10:31:56 PM
To: Dovecot Mailing List
Subject: Re: SolrCore 'dovecot' is not available due to init failure: fieldType 'text_general' not found in the schema
 
https://wiki.dovecot.org/Plugins/FTS/Solr 
 
Only offers a solr-7.7.0 solrconfig.xml, does it apply to solr-8.0.0? 


On Tue, Apr 23, 2019 at 11:18 AM luckydog xf <luckydogxf@gmail.com> wrote:
Here is solrconfig.xml, I removed comments.
--------------------

<?xml version="1.0" encoding="UTF-8"?>
<config>
  <luceneMatchVersion>8.0.0</luceneMatchVersion>
  <lib dir="${solr.install.dir:../../../..}/contrib/extraction/lib" regex=".*\.jar"/>
  <lib dir="${solr.install.dir:../../../..}/dist/" regex="solr-cell-\d.*\.jar"/>
  <lib dir="${solr.install.dir:../../../..}/contrib/clustering/lib/" regex=".*\.jar"/>
  <lib dir="${solr.install.dir:../../../..}/dist/" regex="solr-clustering-\d.*\.jar"/>
  <lib dir="${solr.install.dir:../../../..}/contrib/langid/lib/" regex=".*\.jar"/>
  <lib dir="${solr.install.dir:../../../..}/dist/" regex="solr-langid-\d.*\.jar"/>
  <lib dir="${solr.install.dir:../../../..}/contrib/velocity/lib" regex=".*\.jar"/>
  <lib dir="${solr.install.dir:../../../..}/dist/" regex="solr-velocity-\d.*\.jar"/>
  <lib dir="${solr.install.dir:../../../..}/dist/" regex="solr-ltr-\d.*\.jar"/>
  <dataDir>${solr.data.dir:}</dataDir>
  <directoryFactory name="DirectoryFactory" class="${solr.directoryFactory:solr.NRTCachingDirectoryFactory}"/>
  <codecFactory class="solr.SchemaCodecFactory"/>
  <indexConfig>
    <lockType>${solr.lock.type:native}</lockType>
  </indexConfig>
  <jmx/>
  <updateHandler class="solr.DirectUpdateHandler2">
    <updateLog>
      <str name="dir">${solr.ulog.dir:}</str>
      <int name="numVersionBuckets">${solr.ulog.numVersionBuckets:65536}</int>
    </updateLog>
    <autoCommit>
      <maxTime>${solr.autoCommit.maxTime:15000}</maxTime>
      <openSearcher>false</openSearcher>
    </autoCommit>
    <autoSoftCommit>
      <maxTime>${solr.autoSoftCommit.maxTime:-1}</maxTime>
    </autoSoftCommit>
  </updateHandler>
  <query>
    <maxBooleanClauses>${solr.max.booleanClauses:1024}</maxBooleanClauses>
    <filterCache class="solr.FastLRUCache" size="512" initialSize="512" autowarmCount="0"/>
    <queryResultCache class="solr.LRUCache" size="512" initialSize="512" autowarmCount="0"/>
    <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"/>
    <enableLazyFieldLoading>true</enableLazyFieldLoading>
    <queryResultWindowSize>20</queryResultWindowSize>
    <queryResultMaxDocsCached>200</queryResultMaxDocsCached>
    <listener event="newSearcher" class="solr.QuerySenderListener">
      <arr name="queries"/>
    </listener>
    <listener event="firstSearcher" class="solr.QuerySenderListener">
      <arr name="queries"/>
    </listener>
    <useColdSearcher>false</useColdSearcher>
  </query>
  <requestDispatcher>
    <httpCaching never304="true"/>
  </requestDispatcher>
  <requestHandler name="/select" class="solr.SearchHandler">
    <lst name="defaults">
      <str name="echoParams">explicit</str>
      <int name="rows">10</int>
    </lst>
  </requestHandler>
  <requestHandler name="/query" class="solr.SearchHandler">
    <lst name="defaults">
      <str name="echoParams">explicit</str>
      <str name="wt">json</str>
      <str name="indent">true</str>
    </lst>
  </requestHandler>
  <requestHandler name="/browse" class="solr.SearchHandler" useParams="query,facets,velocity,browse">
    <lst name="defaults">
      <str name="echoParams">explicit</str>
    </lst>
  </requestHandler>
  <initParams path="/update/**,/query,/select,/tvrh,/elevate,/spell,/browse">
    <lst name="defaults">
      <str name="df">_text_</str>
    </lst>
  </initParams>
  <requestHandler name="/update/extract" startup="lazy" class="solr.extraction.ExtractingRequestHandler">
    <lst name="defaults">
      <str name="lowernames">true</str>
      <str name="fmap.content">_text_</str>
    </lst>
  </requestHandler>
  <searchComponent name="spellcheck" class="solr.SpellCheckComponent">
    <str name="queryAnalyzerFieldType">text_general</str>
    <lst name="spellchecker">
      <str name="name">default</str>
      <str name="field">_text_</str>
      <str name="classname">solr.DirectSolrSpellChecker</str>
      <str name="distanceMeasure">internal</str>
      <float name="accuracy">0.5</float>
      <int name="maxEdits">2</int>
      <int name="minPrefix">1</int>
      <int name="maxInspections">5</int>
      <int name="minQueryLength">4</int>
      <float name="maxQueryFrequency">0.01</float>
    </lst>
  </searchComponent>
  <requestHandler name="/spell" class="solr.SearchHandler" startup="lazy">
    <lst name="defaults">
      <str name="spellcheck.dictionary">default</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>
  <searchComponent name="tvComponent" class="solr.TermVectorComponent"/>
  <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>
  <searchComponent name="terms" class="solr.TermsComponent"/>
  <requestHandler name="/terms" class="solr.SearchHandler" startup="lazy">
    <lst name="defaults">
      <bool name="terms">true</bool>
      <bool name="distrib">false</bool>
    </lst>
    <arr name="components">
      <str>terms</str>
    </arr>
  </requestHandler>
  <searchComponent name="elevator" class="solr.QueryElevationComponent">
    <str name="queryFieldType">string</str>
  </searchComponent>
  <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>
  <searchComponent class="solr.HighlightComponent" name="highlight">
    <highlighting>
      <fragmenter name="gap" default="true" class="solr.highlight.GapFragmenter">
        <lst name="defaults">
          <int name="hl.fragsize">100</int>
        </lst>
      </fragmenter>
      <fragmenter name="regex" class="solr.highlight.RegexFragmenter">
        <lst name="defaults">
          <int name="hl.fragsize">70</int>
          <float name="hl.regex.slop">0.5</float>
          <str name="hl.regex.pattern">[-\w ,/\n\"']{20,200}</str>
        </lst>
      </fragmenter>
      <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>
      <encoder name="html" class="solr.highlight.HtmlEncoder"/>
      <fragListBuilder name="simple" class="solr.highlight.SimpleFragListBuilder"/>
      <fragListBuilder name="single" class="solr.highlight.SingleFragListBuilder"/>
      <fragListBuilder name="weighted" default="true" class="solr.highlight.WeightedFragListBuilder"/>
      <fragmentsBuilder name="default" default="true" class="solr.highlight.ScoreOrderFragmentsBuilder"/>
      <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">.,!?
&#13;</str>
        </lst>
      </boundaryScanner>
      <boundaryScanner name="breakIterator" class="solr.highlight.BreakIteratorBoundaryScanner">
        <lst name="defaults">
          <str name="hl.bs.type">WORD</str>
          <str name="hl.bs.language">en</str>
          <str name="hl.bs.country">US</str>
        </lst>
      </boundaryScanner>
    </highlighting>
  </searchComponent>
  <updateProcessor class="solr.UUIDUpdateProcessorFactory" name="uuid"/>
  <updateProcessor class="solr.RemoveBlankFieldUpdateProcessorFactory" name="remove-blank"/>
  <updateProcessor class="solr.FieldNameMutatingUpdateProcessorFactory" name="field-name-mutating">
    <str name="pattern">[^\w-\.]</str>
    <str name="replacement">_</str>
  </updateProcessor>
  <updateProcessor class="solr.ParseBooleanFieldUpdateProcessorFactory" name="parse-boolean"/>
  <updateProcessor class="solr.ParseLongFieldUpdateProcessorFactory" name="parse-long"/>
  <updateProcessor class="solr.ParseDoubleFieldUpdateProcessorFactory" name="parse-double"/>
  <updateProcessor class="solr.ParseDateFieldUpdateProcessorFactory" name="parse-date">
    <arr name="format">
      <str>yyyy-MM-dd['T'[HH:mm[:ss[.SSS]][z</str>
      <str>yyyy-MM-dd['T'[HH:mm[:ss[,SSS]][z</str>
      <str>yyyy-MM-dd HH:mm[:ss[.SSS]][z</str>
      <str>yyyy-MM-dd HH:mm[:ss[,SSS]][z</str>
      <str>[EEE, ]dd MMM yyyy HH:mm[:ss] z</str>
      <str>EEEE, dd-MMM-yy HH:mm:ss z</str>
      <str>EEE MMM ppd HH:mm:ss [z ]yyyy</str>
    </arr>
  </updateProcessor>
  <updateProcessor class="solr.AddSchemaFieldsUpdateProcessorFactory" name="add-schema-fields">
    <lst name="typeMapping">
      <str name="valueClass">java.lang.String</str>
      <str name="fieldType">text_general</str>
      <lst name="copyField">
        <str name="dest">*_str</str>
        <int name="maxChars">256</int>
      </lst>
      <bool name="default">true</bool>
    </lst>
    <lst name="typeMapping">
      <str name="valueClass">java.lang.Boolean</str>
      <str name="fieldType">booleans</str>
    </lst>
    <lst name="typeMapping">
      <str name="valueClass">java.util.Date</str>
      <str name="fieldType">pdates</str>
    </lst>
    <lst name="typeMapping">
      <str name="valueClass">java.lang.Long</str>
      <str name="valueClass">java.lang.Integer</str>
      <str name="fieldType">plongs</str>
    </lst>
    <lst name="typeMapping">
      <str name="valueClass">java.lang.Number</str>
      <str name="fieldType">pdoubles</str>
    </lst>
  </updateProcessor>
  <updateRequestProcessorChain name="add-unknown-fields-to-the-schema" default="${update.autoCreateFields:true}" processor="uuid,remove-blank,field-name-mutating,parse-boolean,parse-long,parse-double,parse-date,add-schema-fields">
    <processor class="solr.LogUpdateProcessorFactory"/>
    <processor class="solr.DistributedUpdateProcessorFactory"/>
    <processor class="solr.RunUpdateProcessorFactory"/>
  </updateRequestProcessorChain>
  <queryResponseWriter name="json" class="solr.JSONResponseWriter">
    <str name="content-type">text/plain; charset=UTF-8</str>
  </queryResponseWriter>
  <queryResponseWriter name="velocity" class="solr.VelocityResponseWriter" startup="lazy">
    <str name="template.base.dir">${velocity.template.base.dir:}</str>
    <str name="solr.resource.loader.enabled">${velocity.solr.resource.loader.enabled:true}</str>
    <str name="params.resource.loader.enabled">${velocity.params.resource.loader.enabled:false}</str>
  </queryResponseWriter>
  <queryResponseWriter name="xslt" class="solr.XSLTResponseWriter">
    <int name="xsltCacheLifetimeSeconds">5</int>
  </queryResponseWriter>
</config>



On Tue, Apr 23, 2019 at 10:57 AM luckydog xf <luckydogxf@gmail.com> wrote:
Hello, it seems an  mismatch of schema file provided by dovecot-2.3.5.2 

[root@mail conf]# pwd
/var/solr/data/dovecot/conf

# Below solrconfig.xml is from Solr-8.0.0.

[root@mail conf]# grep text_general solrconfig.xml

    <str name="queryAnalyzerFieldType">text_general</str>
       field types. Text content will be indexed as "text_general" as
      <str name="fieldType">text_general</str>

# schema is from /usr/share/doc/dovecot/solr-schema.xml

dovecot-2.3.5.2 and the latest solr-8.0.0.

It seems XMLs do not match each other. How can I fix this problem?

Thanks.