[Bug]: aws_elasticsearch_domain has persistent diff when IOPS is omitted

[jar-b]

Terraform Core Version

v1.3.4

AWS Provider Version

v4.36.0

Affected Resource(s)

• aws_elasticsearch_domain

Expected Behavior

If EBS options are enabled, and ebs_options.0.iops is omitted, no diff should be show on a subsequent plan.

Actual Behavior

A persistent diff is present on the iops attribute.

Relevant Error/Panic Output Snippet

Terraform will perform the following actions:

  # aws_elasticsearch_domain.example will be updated in-place
  ~ resource "aws_elasticsearch_domain" "example" {
        id                    = "arn:aws:es:eu-north-1:012345678901:domain/example"
        tags                  = {
            "Domain" = "TestDomain"
        }
        # (8 unchanged attributes hidden)

      ~ ebs_options {
          - iops        = 3000 -> null
            # (4 unchanged attributes hidden)
        }

        # (8 unchanged blocks hidden)
    }

Plan: 0 to add, 1 to change, 0 to destroy.

Terraform Configuration Files

terraform {
  required_providers {
    aws = {
      source  = "hashicorp/aws"
      version = "4.36.0"
    }
  }
}

provider "aws" {}

resource "aws_elasticsearch_domain" "example" {
  domain_name           = "example"
  elasticsearch_version = "7.10"

  cluster_config {
    instance_type = "t3.small.elasticsearch"
  }

  ebs_options {
    ebs_enabled = true
    volume_size = 10
  }

  tags = {
    Domain = "TestDomain"
  }
}

Steps to Reproduce

1. terraform init and terraform apply with the configuration above.
2. terraform plan and observe diff

Debug Output

No response

Panic Output

No response

Important Factoids

The same issue documented in #27510, but for the elasticsearch namespace version of this resource.

References

No response

Would you like to implement a fix?

Yes

[github-actions]

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[github-actions]

This functionality has been released in v4.51.0 of the Terraform AWS Provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

For further feature requests or bug reports with this functionality, please create a new GitHub issue following the template. Thank you!

[github-actions]

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