See comments on https://hibernate.atlassian.net/browse/HSEARCH-4867

I have a branch with some early work, but can’t really test it yet (see https://hibernate.atlassian.net/browse/HSEARCH-4919 ). We should probably release this as an incubating feature, logging warnings whenever someone attempts to use AWS OpenSearch Serverless and directing them to either https://hibernate.atlassian.net/browse/HSEARCH-4867 or https://hibernate.atlassian.net/browse/HSEARCH-4919 (or both).