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Elastic Docs ›Elasticsearch Reference [6.0] ›Set up Elasticsearch ›Important System Configuration

Number of threads

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Number of threads

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Elasticsearch uses a number of thread pools for different types of operations. It is important that it is able to create new threads whenever needed. Make sure that the number of threads that the Elasticsearch user can create is at least 4096.

This can be done by setting ulimit -u 4096 as root before starting Elasticsearch, or by setting nproc to 4096 in /etc/security/limits.conf.

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