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https://issues.apache.org/jira/browse/LUCENE-6982?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15105695#comment-15105695
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Ryan Ernst commented on LUCENE-6982:
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+1
> throw IAE on illegal bm25 parameter values
> ------------------------------------------
>
> Key: LUCENE-6982
> URL: https://issues.apache.org/jira/browse/LUCENE-6982
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Robert Muir
> Attachments: LUCENE-6982.patch
>
>
> Rather than strange behavior, we should throw an exception if these values
> are wrong.
> This can often detect if the two values got "mixed up", because typical
> values of k1 are > 1 (e.g. 1.2, 2.0), but b is only defined between 0 and 1.
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