Elasticsearch uses only half of the processor cores, even at full load

Question

I installed Elasticsearch on my server (Windows Server 2012). When I execute several query requests as a stress test, only half of the processor cores are used. Why?

Answer 1

Do you use elasticsearch default configuration?

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( ) elasticsearch.yml:

threadpool.search.type: fixed
threadpool.search.size: <num-of-threads>

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