aws_elasticsearch_domain: Allow setting custom endpoint

[phyrog]

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Description

According to the API docs, elastic search domains support three fields not yet supported by Terraform:

• DomainEndpointOptions.CustomEndpointEnabled
• DomainEndpointOptions.CustomEndpoint
• DomainEndpointOptions.CustomEndpointCertificateArn

These allow users to use a custom endpoint for their elastic search domain instead of the auto-generated one.

New or Affected Resource(s)

• aws_elasticsearch_domain

Potential Terraform Configuration

resource "aws_elasticsearch_domain" "es" {
  domain_name           = var.domain
  elasticsearch_version = "6.3"

  domain_endpoint_options {
    custom_endpoint_enabled         = true
    custom_endpoint                 = "www.my-custom-endpoint.com"
    custom_endpoint_certificate_arn = "arn:aws:iam::123456789012:certificate/my-certificate"
  }
}

References

• https://docs.aws.amazon.com/elasticsearch-service/latest/developerguide/es-configuration-api.html#es-configuration-api-actions-createelasticsearchdomain
• https://docs.aws.amazon.com/elasticsearch-service/latest/developerguide/es-customendpoint.html
• https://aws.amazon.com/about-aws/whats-new/2020/11/amazon-elasticsearch-service-now-supports-defining-a-custom-name-for-your-domain-endpoint/

[ewbankkit]

@phyrog Thanks for raising this issue.
It has already been noticed in #16059. I'm going to close this one as a duplicate so that we can concentrate discussion in the linked issue.
Please add any additional comments there.

[phyrog]

Ah for some reason that issue did not show up when I searched for existing issues

[ghost]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.

If you feel this issue should be reopened, we encourage creating a new issue linking back to this one for added context. Thanks!