Documentation says : Aim for shard sizes between 10GB and 50GB but does not specifiy if it concerns only primary or primary AND replicas
I mean, I have an index of 200GB and wants 1 replica. So total index size will be 400GB.
Formula will be 400GB/50 or 200GB/50 ?
In the first case, I would set 4 primary shards and 1 replica (8 shards per inex), and in the second case I would set 2 primaries and 1 replica (4 shards per index)