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Also see Breaking changes in 5.6.
- Security: reduce garbage during index resolution #30180
- Bulk operation fail to replicate operations when a mapping update times out #30244
- Fix the version ID for v5.6.10. #29570
- Fix BWC serialization for GeoDistance #29501
- REST API
- Protect against NPE in RestNodesAction #29059
- Remove Stored Script Check for Empty Code Strings #27322