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  1. Solr
  2. SOLR-8057

Change default Sim to BM25 (w/backcompat config handling)

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    • Task
    • Status: Resolved
    • Blocker
    • Resolution: Fixed
    • None
    • 6.0
    • None
    • None

    Description

      LUCENE-6789 changed the default similarity for IndexSearcher to BM25 and renamed "DefaultSimilarity" to "ClassicSimilarity"

      Solr needs to be updated accordingly:

      • a "ClassicSimilarityFactory" should exist w/expected behavior/javadocs
      • default behavior (in 6.0) when no similarity is specified in configs should (ultimately) use BM25 depending on luceneMatchVersion
        • either by assuming BM25SimilarityFactory or by changing the internal behavior of DefaultSimilarityFactory
      • comments in sample configs need updated to reflect new default behavior
      • ref guide needs updated anywhere it mentions/implies that a particular similarity is used (or implies TF-IDF is used by default)

      Attachments

        1. SOLR-8057.patch
          9 kB
          Chris M. Hostetter
        2. SOLR-8057.patch
          46 kB
          Chris M. Hostetter

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            hossman Chris M. Hostetter
            hossman Chris M. Hostetter
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