I find my es cluster sometimes index docs(use bulk api) very slow.
At that time,I use cat thread_pool api find bulk.active are all less 2(bulk.size are all 32).And i find my server's CPU's usage are also very little.And the disk's write/per second just nearly 80M/s (3 800G+ SSD disk use raid0).And there are no query at that time.
How i to find out why es index slow?
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