Nothing new here, no.

If you're interested and you need it urgently, you can have a look at converting the hibernate-search-backend-elasticsearch-aws module to use the official AWS SDK instead of the current (minimal) library. The code is here: https://github.com/hibernate/hibernate-search/tree/master/backend/elasticsearch-aws and the contribution guide is here: https://github.com/hibernate/hibernate-search/blob/master/CONTRIBUTING.md .

Then, you'll probably be able to add new ways to provide credentials. I believe the AWS SDK supports various solutions, including environment variables.