PUT https://people.googleapis.com/v1/contactGroups/7ca51a518ce79592?prettyPrint=false
Host: people.googleapis.com
Content-Type: application/json

{
  "contactGroup": {
    "resourceName": "contactGroups/7ca51a518ce79592",
    "etag": "PXZ79VVgck8=",
    "name": "test300 modified",
    "clientData": [
      {
        "key": "Key two",
        "value": "Value two"
      }
    ]
  }
}
