Why is the client node resource hungry?

I set up my client node with 16 cores and 64G memory, and set Elasticsearch to use 50% of the memory. Why does it use a lot of CPU and heap? I point my Kibana and Logstash services to the client node. This screen shot is from the kopf plugin. The client node is the fourth from the top.

https://www.elastic.co/guide/en/elasticsearch/guide/current/distributed-search.html explains it.

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