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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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