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https://issues.apache.org/jira/browse/LUCENE-2286?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12838359#action_12838359
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Michael McCandless commented on LUCENE-2286:
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+1
> enable DefaultSimilarity.setDiscountOverlaps by default
> -------------------------------------------------------
>
> Key: LUCENE-2286
> URL: https://issues.apache.org/jira/browse/LUCENE-2286
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Query/Scoring
> Reporter: Robert Muir
> Attachments: LUCENE-2286.patch
>
>
> I think we should enable setDiscountOverlaps in DefaultSimilarity by default.
> If you are using synonyms or commongrams or a number of other
> 0-posInc-term-injecting methods, these currently screw up your length
> normalization.
> These terms have a position increment of zero, so they shouldnt count towards
> the length of the document.
> I've done relevance tests with persian showing the difference is significant,
> and i think its a big trap to anyone using synonyms, etc: your relevance can
> actually get worse if you don't flip this boolean flag.
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