How to increase elastic search disk space

I just executed the below command which returned the elastic search disk space

GET _cat/nodes?v&h=id,diskTotal,diskUsed,diskAvail,diskUsedPercent


id diskTotal diskUsed diskAvail diskUsedPercent
qzxs 9.6gb 8.7gb 858.8mb 91.29

I'm using ELK docker image and one single node to store shard. I have free space in the machine up to 200GB. I just want to increase the disk space from 858.8 mb to 20GB so that the capacity of storing the data will be large. Can someone assist me how can I achieve this.

I just posted the same with in detail in stackoverflow but no response yet.

Can someone please help me out?

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