Tanimoto Solr Plugin

##HOWTOs:

• Step1: add queryparser in solrconfig.xml

   <queryparser class="org.apache.lucene.analysis.tanimoto.TanimotoQParserPlugin" name="tanimoto" />
  

sample solconfig.xml can be found at testdata/solr/collection1/conf

• Step2: add similarity schema in schema.xml

   <similarity class="org.apache.lucene.analysis.tanimoto.OverlapSimilarity"/>
  

sample schema.xml can be found at testdata/solr/collection1/conf

• Step3: index and perform a query

    {!tanimoto bf="matstringlength"  } 1 2 3 4
  

More examples can be found at the unit testing cases in TestTanimotoQParsersPlugins

##Further Reading about the Tanimoto Score

1. http://en.wikipedia.org/wiki/Jaccard_index
2. http://www.daylight.com/dayhtml/doc/theory/theory.finger.html