Elasticsearch: "high" CPU usage every 6 minutes for one minute

Hi,

I'm running ELK Stack 7.10.0 (elasticsearch, filebeat, kibana, logstash) on the same server. And since two days elasticsearch is doing something every 6 minutes for one minute. The CPU usage is not high, but it's little annoying. I can't see what is happening in the elasticsearch logs.

I'm running it on Ubuntu 20.04.1with

openjdk version "11.0.9.1" 2020-11-04
OpenJDK Runtime Environment AdoptOpenJDK (build 11.0.9.1+1)
OpenJDK 64-Bit Server VM AdoptOpenJDK (build 11.0.9.1+1, mixed mode)

Someone any idea? The server is in idle mode. No load from other processes.

Regards,
Rafal

The nodes hot threads API will tell you the details of what every node is busy doing. If you need help interpreting its output, feel free to share it here or in a gist.

I fixed the problem. After the upgrade to 7.10.0 I removed two days ago the filebeat-7.9.3 template. But there was an empty filebeat-7.9.3-2020-xx-xx-xxxx index. After I removed it (after my post here) the CPU usage is gone.

I don't understand what was the problem, but now it's look good.