[SOLR-8329] SchemaSimilarityFactory should support a config option for the defaultSimilarity

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 5.4, 6.0
• Assignee: Chris M. Hostetter
• Reporter: Chris M. Hostetter
• Created: 21/Nov/15 00:09
• Updated: 09/May/16 18:44
• Resolved: 23/Nov/15 21:04

Description

SchemaSimilarityFactory has an implicit default Similarity instance that it uses for any fieldTypes that don't define their own – we should make this default configurable.

---

Example of how to use this new option from the javadocs...

   <similarity class="solr.SchemaSimilarityFactory" >
     <str name="defaultSimFromFieldType">type-using-custom-dfr</str>
   </similarity>
   ...
   <fieldType name="type-using-custom-dfr" class="solr.TextField">
     ...
     <similarity class="solr.DFRSimilarityFactory">
       <str name="basicModel">I(F)</str>
       <str name="afterEffect">B</str>
       <str name="normalization">H3</str>
       <float name="mu">900</float>
     </similarity>
   </fieldType>
 

Issue Links

• relates to: SOLR-8261 Change the wrapped per-field default in SchemaSimilarityFactory to BM25 (conditional on luceneMatchVersion for backcompat)