Nutanix Community Edition 2.1 is released. There is no more option to use ESXi as hypervisor and the automatic cluster creation is removed. Here is a blog post how to create the single node cluster.
Repurpose old Nutanix hardware
Revive old Nutanix clusters by installing Nutanix Community Edition. Document all node IP addresses and ensure proper switch connection. Use a bootable USB with MBR scheme or mount the CE installer ISO via IPMI. Select the correct disks matching the CE requirements and input the proper IP configurations during installation.