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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