Why does the search active threads equal 0 in kibana

Elastic Stack Elasticsearch
1

I set the search queue capacity up to 2000 a few days ago.
Why does the search active threads equal 0 when the search queue is over than 2000?
When I used kibana to check my dashboard, I got the error info below:

QQ%E5%9B%BE%E7%89%8720180927162247
QQ图片20180927162247.png1581×936 157 KB

My ec2 environment of elasticsearch bases on the info below:
4 core cpu
16G ram
window 2008

The frequency of this issue above is not at a high level.

There are several visualizes in my dashboard. Each of them set an aggregation at least. I have no idea what caused this issue.

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