Solr stop words replaced with _ symbol

问题

I have problems with solr stopwords in my autosuggest. All stopwords was replaced by _ symbol.

For example I have text "the simple text in" in field "deal_title". When I try to search word "simple" solr show me next result "_ simple text _" but I expect "simple text".

Could someone explain me why this works in such way and how to fix it ? Here is part of my schema.xml

<fieldType class="solr.TextField" name="text_auto">
    <analyzer type="index">
        <charFilter class="solr.HTMLStripCharFilterFactory"/>
        <tokenizer class="solr.StandardTokenizerFactory"/>
        <filter class="solr.StopFilterFactory" ignoreCase="true" words="stopwords.txt" />
        <filter class="solr.LowerCaseFilterFactory"/>
        <filter class="solr.RemoveDuplicatesTokenFilterFactory"/> 
        <filter class="solr.ShingleFilterFactory" maxShingleSize="3" outputUnigrams="true" outputUnigramsIfNoShingles="false" /> 
    </analyzer> 
    <analyzer type="query">
        <filter class="solr.RemoveDuplicatesTokenFilterFactory"/> 
        <tokenizer class="solr.StandardTokenizerFactory"/> 
        <filter class="solr.StopFilterFactory" ignoreCase="true" words="stopwords.txt" />
    </analyzer>
</fieldType>

<field name="deal_title" type="text_auto" indexed="true" stored="true" required="false" multiValued="false"/>

<fieldType name="text_general" class="solr.TextField">
  <analyzer type="index">
    <tokenizer class="solr.KeywordTokenizerFactory"/>
    <filter class="solr.StopFilterFactory" ignoreCase="true" words="stopwords.txt" enablePositionIncrements="false"/>
    <filter class="solr.LowerCaseFilterFactory"/>
  </analyzer>
  <analyzer type="query">
    <tokenizer class="solr.KeywordTokenizerFactory"/>
    <filter class="solr.StopFilterFactory" ignoreCase="true" words="stopwords.txt" enablePositionIncrements="false"/>
    <filter class="solr.LowerCaseFilterFactory"/>
  </analyzer>
</fieldType>

回答1:

My solution to this in Solr 6.3 (where enablePositionIncrements="false" isn't possible anymore) was to:

1. remove stopwords
2. shingle with fillerToken="" (which removes the _)
3. remove leading and trailing spaced

4. remove duplicates

   <filter class="solr.StopFilterFactory" format="snowball" words="lang/stopwords_de.txt" ignoreCase="true"/>
   <filter class="solr.ShingleFilterFactory" fillerToken=""/>
   <filter class="solr.PatternReplaceFilterFactory" pattern="(^ | $)" replacement=""/>
   <filter class="solr.RemoveDuplicatesTokenFilterFactory"/>
   

回答2:

To fix this you need to use<filter class="solr.StopFilterFactory" words="stopwords.txt" ignoreCase="true" enablePositionIncrements="false" />and <luceneMatchVersion>4.3</luceneMatchVersion> in solconfig.xml

来源：https://stackoverflow.com/questions/28459949/solr-stop-words-replaced-with-symbol