Sometimes disk.Indices greater than disk.used

I used Elasticsearch 5.2.2. When I use /_cat/allocation to get the disk store information, sometimes I find there are disk.Indices greater than disk.used. what it's means?
"disk.total": "1268138754048",
"disk.percent": "54",
"disk.used": "692347600896",
"disk.indices": "895363422936",

Can you also gist the output you get from GET /_nodes/stats?

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