AWS::OpenSearchService::Domain - [Coverage] - Missing HostedZoneId

### Name of the resource

AWS::OpenSearchService::Domain

### Resource name

_No response_

### Description

We can use GetAtt to get DomainEndpointV2 of an OpenSearchService::Domain instance but we can't query the HostedZoneId of the domain endpoint. The HostedZoneId is needed to define an alias target in CloudFormation.

### Other Details

_No response_

Start with the issue's AWS::OpenSearchService::Domain resource and the existing GetAtt support for DomainEndpointV2. No repository files, tests, or entry points are identified in the payload; completion would mean documenting or implementing access to the domain endpoint's HostedZoneId for use as a CloudFormation alias target.

Written by the indexing model from the issue text.