High CPU usage of ES client node caused by idle Kibana

Hello. I am running 7 instances of Kibana. Each Kibana is using the same Elasticsearch client node but has its own index in ES. All instances are currently idle but still causing ES client node to have 50% CPU load of my 8core CPU machine. What is Kibana doing? How to prevent idle Kibana to load ES client node so much?

I found it is a problem with PKI auth. I will create a new topic under Elasticsearch.

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