Hi, currently i have
10 nodes with 5 shards, 1 replica
and i don't use dedicated master node.
if i want to use 3 dedicated master node and increase the number of my nodes so the number of shards on every node is still the same (5 shards, 2 replica). should i use 15 or 18 nodes? since from what i read, 3 dedicated master node is no longer data node. And, do i need to re-indexing?