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https://issues.apache.org/jira/browse/LUCENE-7578?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15709795#comment-15709795
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Timothy M. Rodriguez commented on LUCENE-7578:
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Some care would have to be taken with spans, especially with significant slop.
It's arguably worse to have a single highlight across it.
> UnifiedHighlighter: Convert PhraseHelper to use SpanCollector API
> -----------------------------------------------------------------
>
> Key: LUCENE-7578
> URL: https://issues.apache.org/jira/browse/LUCENE-7578
> Project: Lucene - Core
> Issue Type: Improvement
> Components: modules/highlighter
> Reporter: David Smiley
>
> The PhraseHelper of the UnifiedHighlighter currently collects position-spans
> per SpanQuery (and it knows which terms are in which SpanQuery), and then it
> filters PostingsEnum based on that. It's similar to how the original
> Highlighter WSTE works. The main problem with this approach is that it can
> be inaccurate for some nested span queries -- LUCENE-2287, LUCENE-5455 (has
> the clearest example), LUCENE-6796. Non-nested SpanQueries (e.g. that which
> is converted from a PhraseQuery or MultiPhraseQuery) are _not_ a problem.
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