An administrator is provisioning one search head prior to installing ES.

According to the Splunk Enterprise Security Admin documentation, the minimum hardware requirements for a dedicated search head running ES are as follows: OS: 64 bit, RAM: 32 GB, CPU: 16 cores. These requirements are based on the assumption that the search head is not performing any other tasks besides running ES. The documentation also recommends having at least 500 GB of disk space for the search head. References = Splunk Enterprise Security Admin documentation