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Posted to issues@lucene.apache.org by "Nándor Mátravölgyi (Jira)" <ji...@apache.org> on 2019/12/17 23:07:00 UTC
[jira] [Updated] (LUCENE-9093) Unified highlighter with word
separator never gives context to the left
[ https://issues.apache.org/jira/browse/LUCENE-9093?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Nándor Mátravölgyi updated LUCENE-9093:
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Attachment: LUCENE-9093.patch
> 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
> Priority: Major
> Attachments: LUCENE-9093.patch
>
>
> 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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