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https://issues.apache.org/jira/browse/LUCENE-6887?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hoss Man resolved LUCENE-6887.
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Resolution: Fixed
> 5x: backport ClassicSimilarity, mark DefaultSimilarity deprecated & update
> javadocs to mention ClassicSim vs. BM25Sim
> ---------------------------------------------------------------------------------------------------------------------
>
> Key: LUCENE-6887
> URL: https://issues.apache.org/jira/browse/LUCENE-6887
> Project: Lucene - Core
> Issue Type: Task
> Reporter: Hoss Man
> Assignee: Hoss Man
> Fix For: 5.4
>
> Attachments: LUCENE-6887.patch
>
>
> LUCENE-6789 changed the default Similarity on trunk to BM25, and renamed
> DefaultSimiliarity to ClassicSimilarity for backcompat w/o confusion about
> the "default" name.
> But nothing related to this change was committed to the 5x branch.
> On the 5x branch we should:
> * mark DefaultSimiliarity deprecated
> * provide a ClassicSimilarity for 5.x users to switch to to resolve
> deprecations w/o changing behavior (and allow smooth upgrade to 6.x later)
> * note in the DefaultSimiliarity javadocs that starting with 6.0 BM25 will be
> the recommended default and users should investigate it
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