Tim Retout created SOLR-11516:
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Summary: 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: 7.1, 6.4
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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