Alfred Staflinger ORM 5.2 made many changes in preparation for a solid cleanup of APIs which is coming in version 6.0; the changes in 5.2 are meant to be backwards compatible for an end user's perspective, so that you can all benefit from warnings generated by `@deprecated` annotations, and so on.. but Hibernate Search integrates in a much deeper way, to the point that creating a single build which would work for both ORM 5.1 and 5.2 is either impossible or way too much work.

The plan is to instead create a new version of Hibernate Search for users of ORM 5.2, which will also be strictly API backwards compatible (from the point of view of users). We just need a bit of time to finish it

In the meantime, Hibernate Search users can definitely still use Hibernate ORM 5.0 or 5.1, these stable branch versions are not unmantained.