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Elastic Cloud change history: Elasticsearch 9.5.1: false-positive matches in certain boolean queries
| When (UTC) | Change | Kind |
|---|---|---|
| Major incident: Elasticsearch 9.5.1: false-positive matches in certain boolean queries Elastic Cloud reported a major Elasticsearch 9.5.1 issue causing false-positive matches in boolean queries combining multi-value terms in must, filter, or should clauses with must_not on fields with disabled indexing. It ran from 2026-08-14 09:22 UTC to 2026-08-20 17:09 UTC (6 days 7 h); Elasticsearch 9.5.2 fixes it, and customers on 9.5.0 or 9.5.1 should upgrade. | Major incident |