Nodes Stats: disk_service_time

Elastic Stack Elasticsearch
1

Hi,

debugging a performance problem on an Elasticsearch cluster (running Elasticsearch version 1.7.5) and I suspect that disk I/O might be the bottleneck (since CPU and memory are clearly not).
I am monitoring the /_nodes/stats metrics from all the nodes, and I noticed disk_service_time among the fs metrics.
Can someone explain what this metric says precisely?

Thanks in advance

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