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A comment on BM25 – The Next Generation of Lucene Relevance.

Re:BM25 – The Next Generation of Lucene Relevance by asjo on Sunday March 13, 2016 @05:36PM (#11279457)
Xapian has been using BM25 forever[1] - what made Lucene switch now?

[1] https://xapian.org/docs/bm25.html

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Re:BM25 – The Next Generation of Lucene Relevance by apatry on Sunday March 13, 2016 @07:14PM (#11279902)
BM25 has been available for Lucene since version 4 thanks to a refactoring that allowed anyone to plug in a custom relevance score if I remember correctly . The big news is that starting version 6, BM25 is the default.
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Re:BM25 – The Next Generation of Lucene Relevance by asjo on Monday March 14, 2016 @12:37AM (#11281100)
Yes, so I am asking why is Lucene switching now?
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Re:BM25 – The Next Generation of Lucene Relevance by nl on Monday March 14, 2016 @05:05AM (#11281741)
Here's the issue tracking[1].

Basically it looks like the typical conservative approach most large scale open source projects are forced to take because of cross dependencies.

It's a (potentially) breaking change, so they waited for a major release.

[1] https://issues.apache.org/jira/browse/LUCENE-6789

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