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https://issues.apache.org/jira/browse/LUCENE-9093?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17006704#comment-17006704
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ASF subversion and git services commented on LUCENE-9093:
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Commit 4c9cc2cefd7f3593c4b4e1e5a087e3d206298989 in lucene-solr's branch
refs/heads/gradle-master from Nándor Mátravölgyi
[ https://gitbox.apache.org/repos/asf?p=lucene-solr.git;h=4c9cc2c ]
LUCENE-9093: UnifiedHighlighter LengthGoalBreakIterator frag align
Matches in passages should be centered better on average.
Closes #1123
> Unified highlighter with word separator never gives context to the left
> -----------------------------------------------------------------------
>
> Key: LUCENE-9093
> URL: https://issues.apache.org/jira/browse/LUCENE-9093
> Project: Lucene - Core
> Issue Type: Improvement
> Components: modules/highlighter
> Reporter: Tim Retout
> Assignee: David Smiley
> Priority: Major
> Fix For: 8.5
>
> Attachments: LUCENE-9093.patch
>
> Time Spent: 8h 10m
> Remaining Estimate: 0h
>
> When using the unified highlighter with hl.bs.type=WORD, I am not able to get
> context to the left of the matches returned; only words to the right of each
> match are shown. I see this behaviour on both Solr 6.4 and Solr 7.1.
> Without context to the left of a match, the highlighted snippets are much
> less useful for understanding where the match appears in a document.
> As an example, using the techproducts data with Solr 7.1, given a search for
> "apple", highlighting the "features" field:
> http://localhost:8983/solr/techproducts/select?hl.fl=features&hl=on&q=apple&hl.bs.type=WORD&hl.fragsize=30&hl.method=unified
> I see this snippet:
> "<em>Apple</em> Lossless, H.264 video"
> Note that "Apple" is anchored to the left. Compare with the original
> highlighter:
> http://localhost:8983/solr/techproducts/select?hl.fl=features&hl=on&q=apple&hl.fragsize=30
> And the match has context either side:
> ", Audible, <em>Apple</em> Lossless, H.264 video"
> (To complicate this, in general I am not sure that the unified highlighter is
> respecting the hl.fragsize parameter, although [SOLR-9935] suggests support
> was added. I included the hl.fragsize param in the unified URL too, but it's
> making no difference unless set to 0.)
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