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cleaned up documentation, round 1
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|+### How to choose shards, replicas and cluster size: Rules of Thumb.|
|+sh = shards|
|+rf = replication factor. replicas = 0 implies rf = 1, or 1 replica of each shard.|
|+pm = running data_esnode processes per machine|
|+N = number of machines|
|+n_cores = number of cpu cores per machine|
|+n_disks = number of disks per machine|
|+* You must have at least as many data_esnodes as|
|+ Mandatory: (sh * rf) < (pm * N)|
|+ Shards: shard size < 10GB|
|+More shards = more parallel writes|