What does a user wanting to integrate his database or CRUD service need?

Infrastructure:

1. import the new module
2. Implement an EntitySourceContextBuilder (provides access to a database connection or the crud service)
3. Implement an IdExtractor (entity instance -> id)
4. Implement ObjectInitializer (to load objects by ids)

Then int he core of the application:

1. add Hibernate Search annotations to the entities involved
1. on each C_UD events, add a WorkLoad.index / purge call
2. write full-text queries and run them