There's an interesting experiment in this direction here: https://github.com/permazen/permazen https://github.com/permazen/permazen It maps Java objects to a

There's an interesting experiment in this direction here: https://github.com/permazen/permazen https://github.com/permazen/permazen It maps Java objects to a scalable transactional K/V store of your choice, and handles things like indexing, schema migrations and the rest for you. You express query plans by hand using the Java collections and streams framework.