Different size of disk space for cluster nodes

If I make cluster with different disk space nodes for example 3 nodes one with 1TB and two with 512GB. and I did shards 3 and replica 1.
How elasticsearch will distribute shards and replica on these different size nodes?

What is 512GB nodes are full. How elasticsearch work in this case?

It’ll try to balance everything based on shard count, but if disk space gets too low then the watermarks will likely be hit, see https://www.elastic.co/guide/en/elasticsearch/reference/6.1/disk-allocator.html

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