If you're running on Linux, you must ensure that:
You can see the values with the following commands :
You can set them dynamically for the current session by running the following commands as root:
To set these values more permanently, you must update either /etc/sysctl.d/99-sonarqube.conf (or /etc/sysctl.conf as you wish) to reflect these values.
If the user running SonarQube (sonarqube in this example) does not have the permission to have at least 65536 open descriptors, you must insert this line in /etc/limits.d/99-sonarqube.conf (or /etc/limits.conf as you wish) :
You can get more detail in the Elasticsearch documentation.