Disk space not reducing after snapshot deletion

Deleted snapshot of the indices but still the disk space is not reducing .

Welcome!

If the files that are used by one snapshot are also used by another one, then it is expected.

Thanks for the response.
But I have already deleted all the snapshots and having the same issue.

Which version are you using ?
Which repository type are you using ?

Elasticsearch Version : 6.8.13
Repository type : fs

What is the output of:

GET /_cat/snapshots?v

Result:

{
  "es_backups" : {
    "type" : "fs",
    "settings" : {
      "location" : "/srv/backups/elasticsearch"
    }
  }
}

Really? That's not the output of the cat API.