aws_efs_mount_target dns_name attribute returns aws_efs_filesystem dns_name instead

[pll]

Terraform Version

$ terraform -v
Terraform v0.12.26
+ provider.aws v2.65.0

Terraform Configuration Files

resource "aws_efs_file_system" "fs" {
  creation_token = "my-product"
}

output "efs-file-system-dns-name" {
  value = aws_efs_file_system.fs.dns_name
}

resource "aws_efs_mount_target" "fs" {
  count		  = length(local.pri_subnet_ids)
  file_system_id  = aws_efs_file_system.fs.id
  subnet_id	  = element(local.pri_subnet_ids, count.index)
  security_groups = [ element(aws_security_group.efs.*.id, count.index) ]
}

output "efs-mount-target-dns-name" {
  value = aws_efs_mount_target.fs.*.dns_name
}

outputs:

efs-file-system-dns-name = [
  "fs-f263e871.efs.us-east-1.amazonaws.com",
]

efs-mount-target-dns-name = [
  "fs-f263e871.efs.us-east-1.amazonaws.com",
  "fs-f263e871.efs.us-east-1.amazonaws.com",
  "fs-f263e871.efs.us-east-1.amazonaws.com",
]

Expected Behavior

Expected aws_efs_mount_target.dns_name to be of the form availability-zone.file-system-id.efs.aws-region.amazonaws.com as per the AWS EFS documentation:

https://docs.aws.amazon.com/efs/latest/ug/mounting-fs-mount-cmd-dns-name.html

Actual Behavior

Got the aws_efs_filesystem.dns_name of the form file-system-id.efs.aws-region.amazonaws.com instead, which defeats the entire purpose of creating per-AZ EFS Mount Targets.

Steps to Reproduce

1. Create an EFS volume and mount targets as described by the code above.
2. terraform init
3. terraform apply

[ghost]

This issue has been automatically migrated to hashicorp/terraform-provider-aws#13645 because it looks like an issue with that provider. If you believe this is not an issue with the provider, please reply to hashicorp/terraform-provider-aws#13645.

[ghost]

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