Some help with syntax of volume

[Marc Roos <M....@f1-outsourcing.eu>]

Marathon/mesos complains I should add containerPath, hostPath and mode, 
while I only would like to have the volume section with HOST_PATH. 


{
  "id": "/test",
  "user": "nobody",
  "cpus": 1,
  "mem": 256,
  "disk": 0,
  "instances": 1,
  "acceptedResourceRoles": ["*"],
  "backoffSeconds": 10,
  "container": {
    "type": "MESOS",
    "docker": {
        "image": "test",
        "credential": null,
        "forcePullImage": true
        },
	"volumes": [
      {
	  "containerPath": "/tmp",
        "hostPath": "/tmp",
        "mode": "RW",
	  "volume" : {
        "container_path": "/usr/local/etc",
		"source": {
			"type": "HOST_PATH",
			"host_path": { "path": "/tmp/etc" }
			},
        "mode": "RW" }
      }]
  }
}