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https://issues.apache.org/jira/browse/LUCENE-5455?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14946983#comment-14946983
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Scott Stults commented on LUCENE-5455:
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This is a duplicate of LUCENE-2287, but the added detail of the tests is
valuable and describes the problem cases in more detail than the original issue.
> Nested SpanNear queries lose positional highlights
> --------------------------------------------------
>
> Key: LUCENE-5455
> URL: https://issues.apache.org/jira/browse/LUCENE-5455
> Project: Lucene - Core
> Issue Type: Bug
> Components: modules/highlighter
> Affects Versions: 4.3.1, 4.6.1
> Reporter: Steve Davids
> Fix For: 4.9, Trunk
>
> Attachments: LUCENE-5455-Tests.patch
>
>
> Given text of: "x y z x z x a"
> With a query of: spanNear([spanNear([text:x, text:y, text:z], 0, true),
> text:a], 10, false)
> Resulting highlight: <B>x</B> <B>y</B> <B>z</B> <B>x</B> <B>z</B> <B>x</B>
> <B>a</B>
> Expected highlight: <B>x</B> <B>y</B> <B>z</B> x z x <B>a</B>
> This is caused because WeightedSpanTermExtractor.extractWeightedSpanTerms
> takes the SpanQuery and flattens all terms and uses the positions from the
> outermost SpanNear clause (ignoring the nested SpanNear positions). I believe
> this could be resolved with a little recursion - walking the span query tree
> in the extractWeightedSpanTerms method.
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