[jira] [Created] (LUCENE-6887) 5x: backport ClassicSimilarity, mark DefaultSimilarity deprecated & update javadocs to mention ClassicSim vs. BM25Sim

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

Hoss Man created LUCENE-6887:
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             Summary: 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


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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