I'm a cynical es admin, but I'm pretty sure this is just a polite way of saying "you're still gonna need support" more than it is "it's good to go, run it yourself!"

Between ES and RMQ, I find myself running software written before the cloud was big, but trying to be the drivers of the cloud -- those two pieces consume more resources, both physical and operational then the rest of our stack three times replicated, combined.