How to diagnose the cause of high CPU usage on elasticsearch server?

Question

linux

In general, the question is on topic. There is nothing in the elasticsearch and server logs. In which direction to dig, where to look?

Answer 1

Look here - https://www.elastic.co/guide/en/elasticsearch/guid...
and more specifically on the parameters https://www.elastic.co/guide/en/elasticsearch/refe...
Look at the statistics on the times of the index: search, taking by uid, indexing, merging. Next, look at JVM and OS statistics.