IMPORTANT: No additional bug fixes or documentation updates
will be released for this version. For the latest information, see the
current release documentation.
Number of threads
editNumber of threads
editElasticsearch 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.
The package distributions when run as services under systemd will configure
the number of threads for the Elasticsearch process automatically. No
additional configuration is required.