Difference between disk.indices vs disk.used in cat allocation

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I have a cluster (ES 2.4.5) consisting of 8 nodes, and was checking the size with the cat allocation API:

$ curl -s localhost:9200/_cat/allocation?v
shards disk.indices disk.used disk.avail disk.total disk.percent node
    26         24gb     583gb     10.2tb     10.8tb            5 data03
    26         24gb     583gb     10.2tb     10.8tb            5 data08
    27         24gb     583gb     10.2tb     10.8tb            5 data04
    26         24gb     583gb     10.2tb     10.8tb            5 data07
    26         24gb     583gb     10.2tb     10.8tb            5 data05
    27         24gb     583gb     10.2tb     10.8tb            5 data02
    26         24gb     583gb     10.2tb     10.8tb            5 data06
    26         24gb     583gb     10.2tb     10.8tb            5 data01

disk.used says we are using 583 GB on each node. However, df -h on a given node shows MUCH less (25GB):

$ df -h | grep es
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/vg0-data   11T   25G   11T   1% /mnt/es

So our actual disk utilization is more in line with disk.indices than it is with disk.usage. Can someone please explain the difference between these two stats? The docs are lacking in explanation of the various fields. Thanks!

2

curl localhost:9200/_cat/allocation?help :wink:

used is just that, disk used. disk. indices is usage specifically from ES.

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