[jira] [Assigned] (SOLR-8057) Change default Sim to BM25 (w/backcompat config handling)

["Hoss Man (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SOLR-8057?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Hoss Man reassigned SOLR-8057:
------------------------------

    Assignee: Hoss Man

> 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
>            Assignee: Hoss Man
>            Priority: Blocker
>             Fix For: Trunk
>
>         Attachments: SOLR-8057.patch
>
>
> 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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