Searching for C++ or C# + allowing synonyms in Sunspot

schema.xml

    <fieldType name="text" class="solr.TextField" omitNorms="false">
      <analyzer>
        <!-- <tokenizer class="solr.StandardTokenizerFactory"/> -->
        <tokenizer class="solr.WhitespaceTokenizerFactory"/>
        <filter class="solr.StandardFilterFactory"/>
        <filter class="solr.LowerCaseFilterFactory"/>
        <!-- own attempt to use synonyms -->
        <filter class="solr.SynonymFilterFactory" synonyms="synonyms.txt" ignoreCase="true" expand="false"/>
      </analyzer>
    </fieldType>