Create VM in specific Container

Hello,

I can't find how to specify on which container the disk should be created,

can you help me?
here is my json.

{"spec": {
     "name": "TEST-API",
     "resources": {
       "power_state":"OFF",
       "num_vcpus_per_socket": 1,
       "num_sockets": 1,
       "memory_size_mib": 8192,
       "disk_list": [
         {
          "device_properties": {
            "disk_address": {
              "device_index": 0,
              "adapter_type": "SCSI"
            },
            "device_type": "DISK"
          },
          "disk_size_mib": 8192 
         },
         {
          "device_properties": {
            "disk_address": {
              "device_index": 0,
              "adapter_type": "IDE"
            },
            "device_type": "CDROM"
          }
         }
       ],
       "nic_list":[
         {
           "nic_type": "NORMAL_NIC",
           "is_connected": true,
           "ip_endpoint_list": [
             {
               "ip_type": "DHCP"
             }
           ],
           "subnet_reference": {
             "kind": "subnet",
             "name": "VLAN-130",
             "uuid": "002e2b71-a8ca-4360-86e1-0934aa9035f5"
           }
         }
       ],
       "guest_tools": {
         "nutanix_guest_tools": {
           "state": "ENABLED",
           "iso_mount_state": "MOUNTED"
         }
       }
     },
     "cluster_reference": {
       "kind": "cluster",
       "name": "AA01CLUAHV001",
       "uuid": "0005a425-7396-e383-451d-246e960fb6d0"
     }
   },
   "api_version": "3.1.0",
   "metadata": {
     "kind": "vm"
   }
}

Thanks,

Cirvent