Elastic search disk usage


Just wanted to know how elastic search calculates nodes disk usage when the following query is hit


                "timestamp": 1503512623603,
                "total": {
                    "total_in_bytes": 104022159360,
                    "free_in_bytes": 33077583872,
                    "available_in_bytes": 33060806656,
                    "spins": "true"

Will the output from df command be fairly close to what the above query returns. Which one would be accurate ?

We are designing a monitoring system and want to generate alerts when the disk is running out of space!

Yes, the output should be very close to the output of du/df.

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