About the scope, we can say that `MassIndexer` interface will be bounded to `hibernate-search-mapper-orm` module, as in the legacy one it was bounded to `hibernate-search-orm`.
The main change here will be that " the mass indexer will not manipulate documents directly anymore, it will use a `PojoWorkPlan` and pass the entities to that work plan", paying attention on when to trigger reindexing or not.
In a next step we will create a different/dedicated type of work plan.