Before my time but we had some extended outages owing to rethink. We pushed most of our documents into postgres jsonb. We got pretty far relationalizing the data when I was here, but there was some bad old data that wasn't porting & debates about if the architecture was right, & we gave up the relationalization effort, after a squad worked on it for over a year, basically at the go/no go mark. Sad stuff. But the architecture was pretty meh.
I might suggest checking out ArrangoDB if you are RethinkDB interested. Similar capabilities ish. Very active development. They up sell pretty heavily into the Enterprise offering but the community one is still quite capable.
