我有一个字段，其中包含我想要的所有可搜索文本，其中包含记录的关键字，如下所示：
<field name="boardtext" type="text" indexed="true" stored="false" required="false" omitTermFreqAndPositions="true" />
<copyField source="board_name" dest="boardtext"/>
<copyField source="offers_titles" dest="boardtext"/>
<copyField source="high_category_name" dest="boardtext"/>
但每当我尝试通过此字段获取类似记录（MLT）时，返回的结果为零。我错过了什么吗？ Solr在寻找什么？
更新
文本类型分析器：
<!-- in this example, we will only use synonyms at query time -->
<filter class="solr.SynonymFilterFactory" synonyms="synonyms_test.txt" ignoreCase="true" expand="false"/>
<filter class="solr.SynonymFilterFactory" synonyms="synonyms_list.txt" ignoreCase="true" expand="false"/>
<filter class="solr.SynonymFilterFactory" synonyms="synonyms_auto.txt" ignoreCase="true" expand="false"/>
<!-- Case insensitive stop word removal.
add enablePositionIncrements=true in both the index and query
analyzers to leave a 'gap' for more accurate phrase queries.
-->
<filter class="solr.WordDelimiterFilterFactory" generateWordParts="1" generateNumberParts="1" catenateWords="0" catenateNumbers="0" catenateAll="0" splitOnCaseChange="0" protected="protwords.txt" />
<filter class="solr.WordDelimiterFilterFactory" generateWordParts="1" generateNumberParts="1" catenateWords="1" catenateNumbers="1" catenateAll="0" splitOnCaseChange="1" protected="protwords.txt" />
<!-- Common Grams filter
<filter class="solr.CommonGramsFilterFactory" words="commongrams.txt" ignoreCase="true"/>-->
<filter class="solr.StopFilterFactory" ignoreCase="true" words="stopwords.txt" enablePositionIncrements="true" />
<filter class="solr.PatternReplaceFilterFactory" pattern="(\bcom\b)" replacement="\.$1" replace="all"/>
<!-- Common Grams filter
<filter class="solr.CommonGramsFilterFactory" words="commongrams.txt" ignoreCase="true"/>-->
<filter class="solr.LowerCaseFilterFactory"/>
<filter class="solr.SnowballPorterFilterFactory" language="English" protected="protwords.txt"/>
<filter class="solr.ASCIIFoldingFilterFactory"/>
</analyzer>
<analyzer type="query">
<charFilter class="solr.MappingCharFilterFactory" mapping="mapping-ISOLatin1Accent.txt"/>
<charFilter class="solr.MappingCharFilterFactory" mapping="mapping-special-chars.txt"/>
<tokenizer class="solr.WhitespaceTokenizerFactory"/>
<filter class="solr.SynonymFilterFactory" synonyms="synonyms_test.txt" ignoreCase="true" expand="true"/>
<filter class="solr.SynonymFilterFactory" synonyms="synonyms_list.txt" ignoreCase="true" expand="true"/>
<filter class="solr.SynonymFilterFactory" synonyms="synonyms_auto.txt" ignoreCase="true" expand="true"/>
<!-- <filter class="solr.SynonymFilterFactory" synonyms="synonyms_wn.txt" ignoreCase="true" expand="false"/> -->
<filter class="solr.WordDelimiterFilterFactory" generateWordParts="1" generateNumberParts="1" catenateWords="0" catenateNumbers="0" catenateAll="0" splitOnCaseChange="0" protected="protwords.txt" />
<filter class="solr.WordDelimiterFilterFactory" generateWordParts="1" generateNumberParts="1" catenateWords="1" catenateNumbers="1" catenateAll="0" splitOnCaseChange="1" protected="protwords.txt" />
<filter class="solr.StopFilterFactory" ignoreCase="true" words="stopwords.txt" enablePositionIncrements="true" />
<filter class="solr.PatternReplaceFilterFactory" pattern="(\bcom\b)" replacement="\.$1" replace="all"/>
<!-- Common Grams filter
<filter class="solr.CommonGramsQueryFilterFactory" words="commongrams.txt" ignoreCase="true"/>-->
<filter class="solr.LowerCaseFilterFactory"/>
<filter class="solr.SnowballPorterFilterFactory" language="English" protected="protwords.txt"/>
<filter class="solr.ASCIIFoldingFilterFactory"/>
</analyzer>
</fieldType>