When a new daily index is created, shards tend to be allocated only to a few nodes with sufficient capacity.
It occurs rejected operation because these nodes take every incoming request.
I want to prevent shards from being concentrated in only a few nodes. (Including relocating disks by relocating existing shards)
- The cluster has a few nodes limited by a watermark and others with enough free space.
Also are there any APIs to rebalance shards across existing indexes?