[jira] [Created] (LUCENE-10454) UnifiedHighlighter can miss terms because of query rewrites

["Julie Tibshirani (Jira)" <ji...@apache.org>]

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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