          indexed="true" stored="false" &gt;
   &lt;analyzer class="org.apache.lucene.analysis.standard.StandardAnalyzer"/&gt;
   &lt;similarity class="solr.SweetSpotSimilarityFactory"&gt;
     &lt;float name="hyperbolicTfMin"&gt;3.3&lt;/float&gt;
     &lt;float name="hyperbolicTfMax"&gt;7.7&lt;/float&gt;
     &lt;double name="hyperbolicTfBase"&gt;2.718281828459045&lt;/double&gt; &lt;!-- e --&gt;
     &lt;float name="hyperbolicTfOffset"&gt;5.0&lt;/float&gt;
     &lt;!-- plateau norm, shallower slope --&gt;
