[Bug]: OpenSearch upgrade can lead to resource recreation

[wincus]

Terraform Core Version

1.9.5

AWS Provider Version

5.66.0

Affected Resource(s)

• aws_elasticsearch_domain

Expected Behavior

If the resource is planned for an upgrade with a unsupported target version terraform should fail instead of resulting of a full cluster destroy / create operation.

Actual Behavior

If the target version is not listed as compatible the provider instructs terraform to delete the resource first and then create a new cluster with the target version resulting on a full cluster recreation. This is usually not what users want.

Relevant Error/Panic Output Snippet

No response

Terraform Configuration Files

resource "aws_elasticsearch_domain" "this" {
  domain_name           = "test-opensearch-cluster"
  elasticsearch_version  = "OpenSearch_1.0"
  cluster_config {
    instance_type       = "t3.small.elasticsearch"
    instance_count      = 1
  }
}

Steps to Reproduce

• Create the cluster with version OpenSearch_1.0
• Change elasticsearch_version from OpenSearch_1.0 to Opensearch_1.3 ( note that there is a typo in the target version )
• Run terraform apply
• The cluster is destroyed ( since target version is not listed as compatible )

Debug Output

No response

Panic Output

No response

Important Factoids

No response

References

No response

Would you like to implement a fix?

Yes

[github-actions]

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