Differences between index/_stats size and du -h size

Elastic Stack Elasticsearch
1

Hi everyone!
I have a quick question:

I create random JSON files and send them to elasticsearch.
When I check the sizes of the files using du -h in my centos machine and when I check the stats in the _stats section I get major differences between the results.
for example:

file number --- du -h size ------ /_stats
100 --------------- 404 kb ---------- 297 kb
1000 ------------- 4096 kb -------- 1200 kb
3000 ------------- 12 MB ----------- 3.3 MB

Now is it reasonable that storing somthing in elastic is so much smaller than on linux machine?
Why is the gap is so big?

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