DATA_NODES_COUNT = 96
DATA_NODE_PER_SERVER = 4
SHARDS_PER_DATA_NODE = 2 * 1000 * 1000
REPLICA_COUNT = 2

def servers(s, r = REPLICA_COUNT)
  s * r + s
end

s = 4
puts 'Elasticsearch capacity planner'
while servers(s) <= DATA_NODES_COUNT
  ss = servers(s)
  puts "#{ss / DATA_NODE_PER_SERVER} physical servers lets #{ss} data with total possible capacity - #{SHARDS_PER_DATA_NODE * s}"
  s += 4
end