How can I set compatibility mode for Amazon OpenSearch using CloudFormation? - aws-cloudformation

Question

Since AWS has replaced ElasticSearch with OpenSearch, some clients have issues connecting to the OpenSearch Service.
To avoid that, we can enable compatibility mode during the cluster creation.
Certain Elasticsearch OSS clients, such as Logstash, check the cluster
version before connecting. Compatibility mode sets OpenSearch to
report its version as 7.10 so that these clients continue to work with
the service.
I'm trying to use CloudFormation to create a cluster using AWS::OpenSearchService::Domain instead of AWS::Elasticsearch::Domain but I can't see a way to enable compatibility mode.

Answer 1

To do this in terraform use the config
resource "aws_elasticsearch_domain" "search" {
domain_name = "search"
advanced_options = {
"override_main_response_version" = "true"
}
}
docs can be found can be found here https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/elasticsearch_domain

Answer 2

The AWS::OpenSearchService::Domain CloudFormation resource has a property called AdvancedOptions.
As per documentation, you should pass override_main_response_version to the advanced options to enable compatibility mode.
Example:
Resources:
OpenSearchServiceDomain:
Type: AWS::OpenSearchService::Domain
Properties:
DomainName: 'test'
EngineVersion: 'OpenSearch_1.0'
AdvancedOptions:
override_main_response_version: true

Answer 3

You can add this in the advanced section tab AdvancedOptions.
Example:
Resources:
OpenSearchServiceDomain:
Type: AWS::OpenSearchService::Domain
Properties:
AdvancedOptions:
override_main_response_version: true