terraform-provider-elasticsearch: Watches don't seem to detect diffs made outside of Terraform

Thanks again for putting this provider together! I’m finally getting around to implementing it into our workflows and am looking forward to no longer having to version our Elastic resources ‘manually’ 😃

Doing some quick testing, and I think I’m unable to get the provider to generate a diff on a watch that has been edited outside of Terraform. This is obviously a key part of managing the resources via Terraform, that we want to be able to detected unintended drift in the live resources.

Firstly, some necessary data:

• Terraform v0.11.14
• latest release of terraform-provider-elasticsearch (I think - installed it fresh today, unsure how to 100% check the version though as terraform version shows ‘unversioned’ for the provider)
• cluster is on Elastic Cloud
• sniff is set to false in provider config
• cluster username and password are provided via environment variables
• there are no other provider settings configured

What I did:

1. Successfully created a new watch via Terraform, with a very simple config (see below)
2. Adjusted in Terraform the value of trigger.schedule.interval to 100m, to confirm that the diff is detected and updated (works great!)
3. Adjusted manually via Kibana the value of trigger.schedule.interval to 102m, and ran terraform apply again. At this point I would expect Terraform to want to set the interval back to 100m again - however it detects no diff; no changes to apply (at this point I also tried changing it back to 10m in my code, Terraform then generates a diff but it notes that I’d be changing ‘100m’ to ‘10m’ - i.e. it isn’t aware of the 102m that I set manually in the meantime.

It seems like a bug - I can’t think of something I’ve wrong here as it’s quite a simple test - but would appreciate any insight you can offer. I’m very inexperienced in Go but I might be able to offer a PR given a few pointers!

Watch config used:

resource "elasticsearch_watch" "test" {
  watch_id = "test-watch"

  body = <<EOF
    {
      "trigger": {
        "schedule": {
          "interval": "10m"
        }
      },
      "input": {
        "search": {
          "request": {
            "indices": ["filebeat-*"],
            "body": {
              "query": {
                "match_all" : {}
              }
            }
          }
        }
      },
      "condition": {
        "always": {}
      },
      "actions": {},
      "metadata": {
        "name": "test"
      }
    }
  EOF
}