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Domain logging should be enabled for Elastic Search domains

Explanation

Amazon ES exposes four Elasticsearch logs through Amazon CloudWatch Logs: error logs, search slow logs, index slow logs, and audit logs.

Search slow logs, index slow logs, and error logs are useful for troubleshooting performance and stability issues.

Audit logs track user activity for compliance purposes.

All the logs are disabled by default.

Insecure Example

The following example will fail the AWS057 check.

resource "aws_elasticsearch_domain" "bad_example" {
  domain_name           = "example"
  elasticsearch_version = "1.5"
}

resource "aws_elasticsearch_domain" "bad_example" {
  domain_name           = "example"
  elasticsearch_version = "1.5"

  log_publishing_options {
    cloudwatch_log_group_arn = aws_cloudwatch_log_group.example.arn
    log_type                 = "INDEX_SLOW_LOGS"
    enabled                  = false  
  }
}

Secure Example

The following example will pass the AWS057 check.

resource "aws_elasticsearch_domain" "good_example" {
  domain_name           = "example"
  elasticsearch_version = "1.5"

  log_publishing_options {
    cloudwatch_log_group_arn = aws_cloudwatch_log_group.example.arn
    log_type                 = "INDEX_SLOW_LOGS"
    enabled                  = true  
  }
}

resource "aws_elasticsearch_domain" "good_example" {
  domain_name           = "example"
  elasticsearch_version = "1.5"

  log_publishing_options {
    cloudwatch_log_group_arn = aws_cloudwatch_log_group.example.arn
    log_type                 = "INDEX_SLOW_LOGS"
    enabled                  = true  
  }
}