We just published 5.8.1.Final, a maintenance release for the 5.8 branch. This release brings several Elasticsearch-related bug fixes.
Here are the most notable changes since Hibernate Search 5.8.0.Final:
HSEARCH-2883: Requests to Elasticsearch clusters with URL-based access control used to fail because of a trailing slash. This is no longer the case.
HSEARCH-2886: In certain circumstances, Elasticsearch requests containing 3 or 4-byte unicode characters could fail. These encoding issues have been resolved.
For a full list of changes since 5.8.0.Final, please see the release notes.
All the necessary information is available (and updated regularly) on hibernate.org.