[9.2] Warn on API key version mismatch (#143127)#143301
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elasticsearchmachine merged 1 commit intoelastic:9.2from Feb 27, 2026
Merged
[9.2] Warn on API key version mismatch (#143127)#143301elasticsearchmachine merged 1 commit intoelastic:9.2from
elasticsearchmachine merged 1 commit intoelastic:9.2from
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During a rolling upgrade, an older node could encounter an API key stamped with a newer version than it recognizes. This hasn't been an issue in practice since API key versions haven't changed, but the assert in maybeBuildIndexRequest treated it as impossible, firing an AssertionError that killed the JVM in CI where assertions are enabled. Replace the assert with a WARN-level log. The update proceeds as before, rewriting the doc with the local node's target version. This matches existing production behavior (where assertions are disabled) but adds observability via the warning.
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Backports the following commits to 9.2: