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https://issues.apache.org/jira/browse/SOLR-13025?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16718681#comment-16718681
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ASF subversion and git services commented on SOLR-13025:
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Commit 5affe7421f3f927e1fcfb7c7cb763179ce686997 in lucene-solr's branch
refs/heads/master from [~janhoy]
[ https://git-wip-us.apache.org/repos/asf?p=lucene-solr.git;h=5affe74 ]
SOLR-13025: SchemaSimilarityFactory fallback to LegacyBM25Similarity for
luceneMatchVersion < 8.0
> SchemaSimilarityFactory fallback to LegacyBM25Similarity
> --------------------------------------------------------
>
> Key: SOLR-13025
> URL: https://issues.apache.org/jira/browse/SOLR-13025
> Project: Solr
> Issue Type: Task
> Security Level: Public(Default Security Level. Issues are Public)
> Components: search
> Affects Versions: master (8.0)
> Reporter: Adrien Grand
> Assignee: Jan Høydahl
> Priority: Blocker
> Fix For: master (8.0)
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> This is a follow-up of LUCENE-8563: Lucene changed its BM25Similarity
> implementation to no longer multiply all scores by (k1 + 1). Solr was left
> unchanged by replacing uses of BM25Similarity with LegacyBM25Similarity which
> returns the same scores as in 7.x.
> This Jira makes the default similarity depend on {{luceneMatchVersion}} for
> back-compat if schema either does not define a similarity of defines
> {{SchemaSimilarityFactory}}. If a user has explicitly defined
> {{BM25SimilarityFactory}} then the new will be used and she will need to
> replace with {{LegacyBM25SimilarityFactory}} if she wants to keep old
> absolute scores (most often not necessary).
> This change is also described in RefGuide and CHANGES.
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