Judging from what I see on irc and when I get called for “our ES cluster is on fire, can you put it out?”, 921 indices is not much. I sometimes joke that I could replace myself with a bot that answers “less indices, less shards” to each and every question about performance and that bot could solve 90% of the problems at a fraction of my cost. But alas, nobody wants to pay for a visit from my bot.