This is quite an old ticket, but I am seeing the same behaviour with our application (hibernate 5.1.10.final, search 5.6.4 final).

We have an entity A with field "address" of abstract type B. B has three possible concrete classes: B1, B2, or B3.

Annotating "address" as @IndexedEmbeddable only indexes the fields in the abstract class.

Any updates? Is this a planned feature to add still?