Disk usage not banalced

Hi,

we have a cluster composed of 2 nodes ... I am new to ES ... but I noticed
that data directories assigned to each node are not holding the same size
of data inside

the disk usage on node01 is :

$ sudo du -sh *
1.7G d1
488M d2
5.1G d3
1.7G d4
9.3G d5
27G d6

on node02:

$ sudo du -sh *
3.9G d1
299M d2
584M d3
5.8G d4
11G d5
24G d6

our version is 0.20.3

how do I rebalance the disk usage safely on a production ?

btw I built another stronger nodes and preparing to move the
indexes/indices to new machines

cheers!

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