_cat/thread_pool (bulk)

I'm seeing bulk with high number, I'm not really sure what it mean and how to deal with it:

X2 bulk                6 0 22511
X2 fetch_shard_started 0 0     0
X2 fetch_shard_store   0 0     0
X2 flush               0 0     0
X2 force_merge         0 0     0
X2 generic             0 0     0
X2 get                 0 0     0
X2 index               0 0     0
X2 listener            0 0     0
X2 management          1 0     0
X2 refresh             0 0     0
X2 search              0 0     0
X2 snapshot            0 0     0
X2 warmer              0 0     0
X1 bulk                8 0     0
X1 fetch_shard_started 0 0     0
X1 fetch_shard_store   0 0     0
X1 flush               0 0     0
X1 force_merge         0 0     0
X1 generic             0 0     0
X1 get                 0 0     0
X1 index               0 0     0
X1 listener            0 0     0
X1 management          1 0     0
X1 refresh             0 0     0
X1 search              0 0     0
X1 snapshot            0 0     0
X1 warmer              0 0     0

Please advise.

https://www.elastic.co/guide/en/elasticsearch/reference/5.4/cat-thread-pool.html explains what each column is, you can also use ?v on the end of the request to show what each column name is.

Basically it looks like that node has rejected a large number of bulk requests.

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