I finally got it!!  Thanks to this 
thread https://groups.google.com/forum/#!topic/elasticsearch/Eb5ERjHXp4Y.   
The syntax has changed where it now requires that the whole be wrapped by a 
query property.

  "query": {
    "filtered": {
      "query": {
        "match_all": {}
      },
      "filter": {
        "missing": {
          "field": "sentences",
          "existence": true,
          "null_value": true
        }
      }
    }
  }

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