Disk space of ELK

Hi All,

I using docker images for elasticsearch and kinbana on Linux host.

And i have limited disk space to manage, so I am using ILM and SLM to delete the old indices so that disk space never reached to threshold.
But still the disk space is getting filled with data.

While doing df -h i found /opt/docker/overlay2 is the filesystem which is consuming the disk space.
Could any one suggest what can be done.
I have confirmed the ILM and SLM is working as it should do.

That's not related to Elasticsearch, unless you have some custom config.