Actually, recommended would be to setup your shard sizing (index rollover) on size and not on time. You would do this to combat oversharding.
In your case, lets assume you have 4 hot nodes, each with 100gb of space.
That means you can store 4 * 100gb = 400gb of data on those nodes. As this is hot you will use 1primary and 1replica shard, reducing the usable space by half -> 200gb. Your shards should be between 30 and 50gb (a lot of reasons but for now just believe me 
) .
Here comes the math:
- space =
4 * 100gb = 400gb/2 = 200gb-> 200gb - indices room =
200gb / 40gb = 5--> 5 indices
In this example you can hold 5 indices on your hot tier (the ingest tier) and once an index reaches the primary shard size of 40gb it does a roll over and moves to your next tier (warm).