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https://issues.apache.org/jira/browse/SOLR-11516?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16212850#comment-16212850
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David Smiley commented on SOLR-11516:
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Hi,
For the UnifiedHighlighter, the interpretation of hl.bs.type is essentially a
pluggable way to establish a snippet boundary. The value of WORD and CHARACTER
are technically supported but probably make no sense. The default is SENTENCE.
Note that the FastVectorHighlighter uses the same parameter name and values but
with a different semantic meaning -- and in its meaning, WORD is what you'd
likely want it at, and it's the default for that highlighter.
When you use the UH with the default hl.bs.type, what snippeting challenges do
you face?
hl.fragsize is supported but it's fidelity is to the hl.bs.type unit --
generally a sentence boundary. With the original Highlighter, it was to the
word edge, which meant it very likely chopped off a sentence, which isn't great.
> Unified highlighter with word separator never gives context to the left
> -----------------------------------------------------------------------
>
> Key: SOLR-11516
> URL: https://issues.apache.org/jira/browse/SOLR-11516
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Components: highlighter
> Affects Versions: 6.4, 7.1
> Reporter: Tim Retout
>
> 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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