I planned to use 4 nodes for index, but when I created index I had only 2 nodes for start and planned to buy other nodes when I need more storage space for index.
So I created an index with 40 shards with "index.routing.allocation.include" to 4 nodes (2 exist, and 2 not exist) and start to index data. When I had 90% storage space on both nodes, I bought another node and add it cluster.
I suppose that automatic cluster rebalance must happen, so some shards will automatically go to new node, but this was not happen and I wonder why?
Thanks in advance!