Terraform provider corrupts trust settings on update

[nick-benoit]

Readiness Checklist

• I am running the latest version
• I checked the documentation and found no answer
• I checked to make sure that this issue has not already been filed
• I am reporting the issue to the correct repository (for multi-repository projects)

Expected Behavior

Trust settings should not be altered unless specified in the terraform file.

Current Behavior

Elasticsearch trust settings are changed by the provider in the following unexpected ways:

• Account trust names are removed
• Direct trust is removed

An example of Elasticsearch cluster data before TF update:

 "trust": {
    "accounts": [
      {
        "account_id": "554443047",
        "name": "Default trust",
        "trust_all": true
      }
    ],
    "external": [],
    "direct": [
      {
        "uid": "9a2d84bb-0619-4e2c-8da1-1151e34ab890",
        ...
        "type": "generic",
        "name": "Test"
      }
    ]
  },

And after TF Update

  "trust": {
    "accounts": [
      {
        "trust_all": true,
        "account_id": "554443047",
        "name": "" # This was removed 
      }
    ],
    "external": [],
    "direct": [] # This was also removed
  },

## Terraform definition

terraform {
  required_version = ">= 0.12.29"

  required_providers {
    ec = {
      source  = "elastic/ec"
      version = "0.10.0"
    }
  }
}

provider "ec" {
  # ECE installation endpoint
  endpoint = "https://public-api.qa.cld.elstc.co"

  # If the ECE installation has a self-signed certificate
  # setting "insecure" to true is required.
  #insecure = false

  # APIKey is the recommended authentication mechanism. When
  # Targeting the Elasticsearch Service, APIKeys are the only
  # valid authentication mechanism.
  apikey = "..."
}

data "ec_stack" "latest" {
  version_regex = "latest"
  region        = "aws-eu-west-1"
}

# Create an Elastic Cloud deployment
resource "ec_deployment" "example_minimal" {
  # Optional name.
  name = "my_example_deployment"

  # Mandatory fields
  region                 = "aws-eu-west-1"
  version                = "8.14.3" #data.ec_stack.latest.version
  deployment_template_id = "aws-io-optimized-v2"

  # Use the deployment template defaults
  elasticsearch = {
    hot = {
      autoscaling = {}
    }

    ml = {
       autoscaling = {
          autoscale = true
       }
    }

  }

  kibana = {
    topology = {}
  }
}

Steps to Reproduce

1. Create a cluster via TF
2. Add direct trust settings via adminconsole
3. Change cluster name via Terraform
4. Use advanced edit to view Elasticsearch cluster settings and verify cluster trust has been changed (direct trusts removed, and account trust names removed)

[gigerdo]

With 0.12.0 the provider will not update trust settings unless they have changed. However the reported problems when updating trust settings have not yet been fixed.