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https://issues.apache.org/jira/browse/LUCENE-7776?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tommaso Teofili resolved LUCENE-7776.
-------------------------------------
    Resolution: Fixed

> Switch KNN classifier to use BM25 similarity
> --------------------------------------------
>
>                 Key: LUCENE-7776
>                 URL: https://issues.apache.org/jira/browse/LUCENE-7776
>             Project: Lucene - Core
>          Issue Type: Improvement
>          Components: modules/classification
>            Reporter: Tommaso Teofili
>            Assignee: Tommaso Teofili
>             Fix For: master (7.0)
>
>
> It'd be good to use BM25 as default {{Similarity}} for KNN classifier.
> Having done some tests on the _20newsgroups_ dataset that resulted in 
> improved _f1_ (between 0.10 and 0.15).



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