With Elasticsearch, projectable = Projectable.YES really is just ceremony, since it has no effect on the Elasticsearch mapping and only enables projections in Hibernate Search itself.

While consistency between backends is a good thing, in this case we’re just adding limitations to the Elasticsearch backend for the sake of consistency, so I don’t think it’s worth it.

We should:

• Define Projectable.DEFAULT as Projectable.YES in Elasticsearch

• Change integration tests accordingly (for the Elasticsearch backend, projections will always work except when using Projectable.NO)

• Update documentation accordingly: javadoc (SearchProjectionFactory, Projectable.DEFAULT, etc.) and reference documentation (projectable + projection DSL).