This is a nightmarish recommendation. Totally get elastic trying to branch out but there are hard (even mathematical) limitations on what a single DB can and should do. The only DB that's presented me with a semi coherent theory about how it should be used as a swiss army knife is Datomic and I would be very skeptical of it at large scales. Also it's based on Prolog and inspired by algebraic DB concepts so is just way outside the mainstream. Elastic search is really convenient for faceted search, so I think it should just stick to that.
Elastic rocks! I've been using it for a new project and am really digging it.
You guys should build in some better profiling tools for logstash. I'd love to be able to see how much time each filter rule took to know where to spend my time optimizing. Since its all in a java virtual machine its tough to see things like how many threads are working hard vs idle and how much memory each is using etc.
A great product and still evolving! :) It is crazy how powerful it becomes with Kibana, but you still have the option for DIY graphics and integrations!
https://www.vaultproject.io/docs/concepts/seal.html