Data taking too much space

hi i am currently using elasticsearch 6.3.2 version. In the monitoring (x-pack) screen it shows
Disk Usage as 13.3 GB, however Disk Available is only 40.7/199.9 GB. I have got 4 nodes in the cluster. Any ideas on what could be wrong that only 13 GB of data is taking around 160 GB of space. Is it expected behavior or i need to tune the cluster?


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