Now, we run 6 nodes and all of them has default role (master/data...).
For more efficient cluster environment, we want to change our cluster like below.
Add 2 master-dedicated node. (new node)
Change one existed node's role to 'master&voting only&data'.
Change 5 existed node's role to 'data only'.
Node1 (default), Node2 (default), Node3 (default),
Node4 (default), Node5 (default), Node6 (default)
Node1 (data), Node2 (data), Node3 (data),
Node4 (data), Node5 (data), Node6 (master&voting only&data)
Node7 (master-dedicated, new node)
Node8 (master-dedicated, new node)
Please let me know, if there is any problem with our plan. (run 2 dedicated master node &
1 voting only node)
If our plan has no problem, please share me recommended process and how to do this
without any downtime.
for reference, we use elasticsearch v7.2