Add a doc on cluster configuration best practices

[coffeemug]

trafficstars

E.g. how many shards should I set up? How many replicas? How many nodes do I need? Etc. Basically, operational best practices.

[chipotle]

Someone else will have to provide at least a bullet point list of advice for this. :)

[coffeemug]

I can (and will) do that.

[danielmewes]

It has been over a year, but this is still something that our users ask about a lot.

[lanjie121828]

hello, is best practices done? @coffeemug @danielmewes