Julie Tibshirani created LUCENE-10454:
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Summary: UnifiedHighlighter can miss terms because of query
rewrites
Key: LUCENE-10454
URL: https://issues.apache.org/jira/browse/LUCENE-10454
Project: Lucene - Core
Issue Type: Bug
Reporter: Julie Tibshirani
Before extracting terms from a query, UnifiedHighlighter rewrites the query
using an empty searcher. If the query rewrites to MatchNoDocsQuery when the
reader is empty, then the highlighter will fail to extract terms. This is more
of an issue now that we rewrite BooleanQuery to MatchNoDocsQuery when any of
its required clauses is MatchNoDocsQuery
(https://issues.apache.org/jira/browse/LUCENE-10412). I attached a patch
showing the problem.
This feels like a pretty esoteric issue, but I figured it was worth raising for
awareness. I think it only applies when weightMatches=false, which isn't the
default. I couldn't find any existing queries in Lucene that would be affected.
We ran into it while upgrading Elasticsearch to the latest Lucene snapshot,
since a couple custom queries rewrite to MatchNoDocsQuery when the reader is
empty.
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