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https://issues.apache.org/jira/browse/LUCENE-8121?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16322099#comment-16322099
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Jim Ferenczi commented on LUCENE-8121:
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The expected score were correct, it's the frequency used to score the terms
that was buggy. I pushed a fix that returns the expected frequency for a term
that appears in a span query and the scores are the same as in the original
commit now. I think it's just a missing change after optimizing some array
resizing, [~dsmiley] ?
> UnifiedHighlighter can highlight terms within SpanNear clauses at unmatched
> positions
> -------------------------------------------------------------------------------------
>
> Key: LUCENE-8121
> URL: https://issues.apache.org/jira/browse/LUCENE-8121
> Project: Lucene - Core
> Issue Type: Bug
> Components: modules/highlighter
> Reporter: David Smiley
> Assignee: David Smiley
> Priority: Minor
> Fix For: 7.3
>
> Attachments: LUCENE-2287_UH_SpanCollector.patch,
> LUCENE-2287_UH_SpanCollector.patch
>
>
> The UnifiedHighlighter (and original Highlighter) highlight phrases by
> converting to a SpanQuery and using the Spans start and end positions to
> assume that every occurrence of the underlying terms between those positions
> are to be highlighted. But this is inaccurate; see LUCENE-5455 for a good
> example, and also LUCENE-2287. The solution is to use the SpanCollector API
> which was introduced after the phrase matching aspects of those highlighters
> were developed.
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