Cluster stats - mem

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1

My cluster returns a stats API response of;

....
"mem": {

        "total": "1.2tb",

        "total_in_bytes": 1350889963520,

        "free": "3.4gb",

        "free_in_bytes": 3708395520,

        "used": "1.2tb",

        "used_in_bytes": 1347181568000,

        "free_percent": 0,

        "used_percent": 100

      }
...

What exactly is this measuring ? The server that hosts all nodes in the cluster only has 256G of RAM so I am wondering about the total figure of 1.2T.

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