I'm kind of surprised this article doesn't mention anything about how many nodes you want in your cluster. Since ES performance starts to degrade once you get past 40 or so nodes .
Certainly a problem with 100-s of nodes. One thing is that GC pauses in big clusters become more problematic as the chance to hit stop-the-world pause on at least one node for every request is getting higher.
Going beyond dozens takes a fair amount of tuning and trouble-shooting.
