High level of storage usage onky for 3 servers

Elastic Stack Elasticsearch
1

I have 40 servers in Elk cluster version 7.5.
A majority of them have a stable storage usage of around 65%, but 3 of them always have a usage over 85% and they grow up continuously

What could be the reason?

2

What is the output of:

GET /
GET /_cat/nodes?v
GET /_cat/health?v
GET /_cat/indices?v

If some outputs are too big, please share them on gist.github.com and link them here.

3

I can't send names , ip address etc bacause of Information security limitations.

4

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