Update API - how to remove inner fields from objects via script?

[Steve Flook]

I have an index that supports dynamic mappings under a field of type Object 
that we named custom.  My doc also has other objects properties with inner 
props.  I attached an abbreviated mapping - notice my object for "realm" 
and it's properties

Using the Update API I can remove a field per the docs 
<http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/docs-update.html>
 
*if* it's a top level field.  For example this works great:

POST 
/test-timbr-2015.02.19/event/0f78c6b6-a30b-436e-bad7-4234654fc5bb/_update
{
    "script" : "ctx._source.remove(\"threadid\")"
}

However, when I run the script against a document that has a field nested 
in a specific object graph the specified field doesn't get deleted.  I'm 
using dot notation as you can see, and when I run this ES comes back with a 
HTTP 200 and the _version property gets incremented.

POST 
/test-timbr-2015.02.19/event/0f78c6b6-a30b-436e-bad7-4234654fc5bb/_update
{
    "script" : "ctx._source.remove(\"realm.name\")"
}

How can I get inner properties like this removed via the Update API.

Thanks for your help.
Steve

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{
  "settings": {
    "number_of_shards": 3,
    "number_of_replicas": 1,
    "refresh_interval": "5s"
  },
  "mappings": {
    "event": {
      "_all": {
        "enabled": true
      },
      "_timestamp": {
        "enabled": true,
        "store": "yes"
      },
      "properties": {
        "id": {
          "type": "string",
          "precision_step": "1"
        },
        "loggeddate": {
          "type": "date",
          "precision_step": "1"
        },
        "level": {
          "type": "string",
          "index": "not_analyzed"
        },
        "name": {
          "type": "multi_field",
          "fields": {
            "analyzed": {
              "type": "string",
              "index": "analyzed"
            },
            "name": {
              "type": "string",
              "index": "not_analyzed"
            }
          }
        },
        "tags": {
          "type": "string",
          "index": "not_analyzed"
        },
        "realm": {
          "type": "object",
          "properties": {
            "type": {
              "type": "string",
              "index": "not_analyzed"
            },
            "name": {
              "type": "string",
              "index": "not_analyzed"
            },
            "host": {
              "type": "string",
              "index": "not_analyzed"
            },
            "instanceid": {
              "type": "string",
              "index": "not_analyzed"
            }
          }
        },
        "custom": {
          "type": "object",
          "index": "not_analyzed"
        }
      }
    }
  }
}