plan for aws_elasticsearch_domain shows differences in 3.10.0 version after 2.70.0

[m3nthal]

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Terraform CLI and Terraform AWS Provider Version

Terraform v0.12.29

• provider.aws v3.1.0
• provider.kubernetes v1.12.0
• provider.template v2.1.2

Affected Resource(s)

• aws_elasticsearch_domain

Terraform Configuration Files

resource "aws_cloudwatch_log_group" "application_logs" {
  count             = var.elastic_enabled == true ? 1 : 0
  name              = "/aws/eks/debug/application-logs"
  # irrelevant parts omitted
}

resource "aws_elasticsearch_domain" "elasticsearch" {
  count                 = var.elastic_enabled == true ? 1 : 0

# irrelevant parts omitted

  log_publishing_options {
    cloudwatch_log_group_arn = aws_cloudwatch_log_group.application_logs.0.arn
    log_type                 = "ES_APPLICATION_LOGS"
    enabled                  = true
  }
}

Debug Output

Relevant part of Terraform plan:

      + log_publishing_options {
          + cloudwatch_log_group_arn = "arn:aws:logs:****************************:log-group:/aws/eks/debug/application-logs"
          + enabled                  = true
          + log_type                 = "ES_APPLICATION_LOGS"
        }
      - log_publishing_options {
          - cloudwatch_log_group_arn = "arn:aws:logs:****************************:log-group:/aws/eks/debug/application-logs:*" -> null
          - enabled                  = true -> null
          - log_type                 = "ES_APPLICATION_LOGS" -> null
        }

Terraform state shows correct arn of the log group (with :* at the end):

resource "aws_cloudwatch_log_group" "search_logs" {
    arn               = "arn:aws:logs:****************************:log-group:/aws/eks/debug/search-logs:*"
   # irrelevant parts omitted
}

Expected Behavior

Terraform plan should not show any differences. As in 2.70.0 version of aws provider.

Actual Behavior

3.10.0 version of aws provider shows differences in arn (note the :* on the end) of the log group, however nothings was changed apart from aws provider version.

Steps to Reproduce

1. terraform apply with aws-provider 2.70.0
2. terraform plan with aws-provider 3.10.0

[anGie44]

Hi @m3nthal thank you for creating this issue! since the major version release of 3.0.0 of the provider, the aws_cloudwatch_log_group resource's arn attribute no longer is returned with the :* suffix, explaining the diff you're seeing. A workaround to suppress this diff is to use the string interpolation "${aws_cloudwatch_log_group}.arn}:*" in the cloudwatch_log_group_arn reference. Further upgrade examples are also available here.

Hope this helps and if you have additional questions, please let me know 😃

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