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Remediation

Enable High Availability for OpenSearch Domain​

To meet high-availability best practices, configure the OpenSearch Service domain with a minimum of three data nodes and enable Zone Awareness.

From Command Line​

Use the update-domain-config command to enable Zone Awareness and set the instance count to three data nodes. This configuration distributes nodes across three Availability Zones.

aws opensearch update-domain-config \
    --domain-name {{domain-name}} \
    --cluster-config '{
        "InstanceCount": 3,
        "ZoneAwarenessEnabled": true,
        "ZoneAwarenessConfig": {
            "AvailabilityZoneCount": 3
        }
    }'

Additional Considerations​

  • The AvailabilityZoneCount value must match the number of Availability Zones supported in the selected AWS Region.
  • For smaller regions that support only two Availability Zones, set AvailabilityZoneCount to 2 while maintaining a minimum of three data nodes.
  • Changes to cluster configuration may trigger a rolling update and can temporarily impact cluster performance.