ttl_enabled doesn't work on update

[alexjurkiewicz]

Describe the Bug

If you deploy this module with ttl_enabled = false, it works. But if you re-run Terraform, the table is marked to be updated with the following diff:

      ~ ttl {
          + attribute_name = "Expires"
            # (1 unchanged attribute hidden)
        }

Which fails:

│ Error: error updating DynamoDB Table (mytable) time to live: error updating DynamoDB Table (mytable) Time To Live: ValidationException: TimeToLive is already disabled
│   status code: 400, request id: 123
│ 
│   with module.dynamodb["mytable"].aws_dynamodb_table.default[0],
│   on .terraform/modules/dynamodb/main.tf line 46, in resource "aws_dynamodb_table" "default":
│   46: resource "aws_dynamodb_table" "default" {

Expected Behavior

No changes on update. Add any other context about the problem here.

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[mwarkentin]

For anyone running into this, I found it worked well when I used the following:

ttl_enabled   = false
ttl_attribute = ""

Possible workaround until this fix lands.