Have you used Elastisch in anger? Last project I used it in I gave up (and so did another colleague) and we started using clj-http + Cheshire to generate the JSON ourselves.
It was not a good experience and trying to get any help with errors netted me angry and uncooperative responses from the maintainer/creator.
No, I haven't exactly had a use-case for it yet. What I've needed so far can be solved with the database.
You do bring up an interesting point though. Some people in the community truly do suck and come across as elitist and are quick to dismiss you as an idiot with no good reason, when reality it is their poor documentation and assumptions that are amiss.
I shouldn't really write the dismissal found in the above paragraph. I've met quite a few Clojure users in real life, and to be honest, the vast majority are humble and just sort of making it up as they go along, albeit at a higher level. Overall, the Clojure community I've been exposed to has been great, and more than willing to help you. Don't let a bad apple ruin the basket.
It was not a good experience and trying to get any help with errors netted me angry and uncooperative responses from the maintainer/creator.