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Elasticsearch 9.5.1: false-positive matches in certain boolean queries

Major Impact Resolved Duration: 6d 7h 47m August 14, 2026

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Elasticsearch 9.5.1 contains a known issue where boolean queries containing a must, filter, or should clause using a multi-value terms query, alongside a must_not clause on fields with disabled indexing, can still return false-positive matches.

While the patch in 9.5.1 (https://github.com/elastic/elasticsearch/pull/155936) resolved the bulk-scorer defect for term and range query paths; multi-value terms queries utilize a different Lucene query type that was not covered by that fix.

Time Ser...
Aug 14, 2026 at 9:22 AM UTC
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