### Is there an existing issue for this?

- [X] I have searched the existing issues and read the documentation

### Question

I am using serverless framework with localstack and I am unable to define an `AWS::OpenSearchService::Domain` resource. I guess I'll have to use `AWS::Elasticsearch::Domain` instead but it is deprecated. Are there any plans to add `AWS::OpenSearchService::Domain` resource soon? 

### Anything else?

_No response_
response = opensearch_client.describe_domain(DomainName=opensearch_domain)
        assert "DomainStatus" in response
        status = response["DomainStatus"]
        assert "EngineVersion" in status
        assert status["EngineVersion"] == OPENSEARCH_DEFAULT_VERSION
        domain_name = opensearch_create_domain(EngineVersion="OpenSearch_1.0")
        response = opensearch_client.describe_domain(DomainName=domain_name)
        assert "DomainStatus" in response
        status = response["DomainStatus"]
        assert "EngineVersion" in status
        assert status["EngineVersion"] == "OpenSearch_1.0"
    def test_update_domain_config(self, opensearch_client, opensearch_domain):
        initial_response = opensearch_client.describe_domain_config(DomainName=opensearch_domain)
        update_response = opensearch_client.update_domain_config(
            DomainName=opensearch_domain, ClusterConfig={"InstanceType": "r4.16xlarge.search"}
        )
        final_response = opensearch_client.describe_domain_config(DomainName=opensearch_domain)
        assert (
            initial_response["DomainConfig"]["ClusterConfig"]["Options"]["InstanceType"]
            != update_response["DomainConfig"]["ClusterConfig"]["Options"]["InstanceType"]
        )
        assert (
            update_response["DomainConfig"]["ClusterConfig"]["Options"]["InstanceType"]
            == "r4.16xlarge.search"
        )
        assert (
            update_response["DomainConfig"]["ClusterConfig"]["Options"]["InstanceType"]
            == final_response["DomainConfig"]["ClusterConfig"]["Options"]["InstanceType"]
        )
    def test_create_indices(self, opensearch_endpoint):