I do among other things elasticsearch consulting and a significant part of the urgent jobs I do is fixing braindead-easy ES setups. It's easy to install and con

I do among other things elasticsearch consulting and a significant part of the urgent jobs I do is fixing braindead-easy ES setups. It's easy to install and configure, it will probably even run fine with a small dataset or few queries, but it will start to fall apart if you're putting load on it and haven't thought at least a little about your setup. That's not a surprising thing in itself, practically no piece of software will just eat any garbage you throw at it, so ES is at least on par with a lot of other options out there. It's often just a small thing, tweaking shard counts and index sizes, using the appropriate instance type, something like that. But it's still easy to get wrong and a lot of people do.