Implementations of LuceneWork (which are API) expect a parameter of type IndexedTypeIdentifier (which is SPI), but they cannot create instances of it, because instances are created through org.hibernate.search.spi.impl.PojoIndexedTypeIdentifier#convertFromLegacy, which is internal code.

There is definitely something wrong here, but fixing the design issue is probably not worth it: we'd need to break SPIs, maybe APIs, and we would probably remove this concept in 6 anyway (because the internals of the Lucene/Elasticsearch integration no longer deal with types, only with indexes).

However, we need to adress the issue of breaking APIs in 5.8.

Our choices:

• Add back the older versions of the constructors, to restore API compatibility
• OR make org.hibernate.search.spi.impl.PojoIndexedTypeIdentifier#convertFromLegacy API. The API break will still be there, but at least people will be able to use the APIs without relying on internal types.