Hoss Man created SOLR-8057:
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Summary: Change default Sim to BM25 (w/backcompat config handling)
Key: SOLR-8057
URL: https://issues.apache.org/jira/browse/SOLR-8057
Project: Solr
Issue Type: Task
Reporter: Hoss Man
Priority: Blocker
Fix For: 6.0
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)
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