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cfn-lint contribution

open-source Open source PR June 2026

A focused upstream fix for a false positive in the legacy Elasticsearch domain instance type enum.

Open SourceCloudFormationPR
GitHub ↗

Issue

AWS::Elasticsearch::Domain was checked with OpenSearch .search instance names.

Patch

The fix restores .elasticsearch values for the legacy resource and adds a regression fixture.

Lesson

Small open-source patches are useful because they force careful reading of existing behavior and maintainer expectations.