We had a performance degradation for 5-10 minutes intervals. We looked into our monitoring tool and found there was high CPU utilization on the elasticsearch cluster. During this time we also noticed high fetch requests and cache eviction. What do the high fetch requests and high cache eviction implies?
Also, the rest of the metrics looked fine. Our slow query settings are set to 1 minute. So, we don't have all the queries which were executed during that time.