A custom field type in Solr

schema.xml

<!--- Other content --->

<fieldType name="case_insensitive_string" class="solr.TextField" positionIncrementGap="100">
  <analyzer type="index">
    <tokenizer class="solr.KeywordTokenizerFactory"/>
    <filter class="solr.ASCIIFoldingFilterFactory"/>
    <filter class="solr.TrimFilterFactory"/>
    <filter class="solr.LowerCaseFilterFactory"/>
    <filter class="solr.RemoveDuplicatesTokenFilterFactory"/>
  </analyzer>
  <analyzer type="query">
    <tokenizer class="solr.KeywordTokenizerFactory"/>
    <filter class="solr.ASCIIFoldingFilterFactory"/>
    <filter class="solr.TrimFilterFactory"/>
    <filter class="solr.LowerCaseFilterFactory"/>
    <filter class="solr.RemoveDuplicatesTokenFilterFactory"/>
  </analyzer>
</fieldType>

<!-- More other content -->