Text Phrase Prefix function generates incorrect JSON

[jamestoyer]

It appears incorrect JSON is being generated when constructing a Text Phrase Prefix query. Currently the JSON generated is something like (note the incorrect type):

{
  "query": {
    "text": {
      "name": {
        "type": "text_phrase_prefix",
        "query": "harry p",
        "operator": "and"
      }
    }
  }
}

Instead it should be (with the correct type)

{
  "query": {
    "text": {
      "name": {
        "type": "phrase_prefix",
        "query": "harry p",
        "operator": "and"
      }
    }
  }
}

Or

{
    "query": {
        "text_phrase_prefix" : {
            "name" : {
                "query" : "harry p",
                "operator" : "and"
            }
        }
    }
}

[rodrigopalhares]

In my tests, the problem occur in text phrase too.
With the wrong type name, the elastic was working like boolean ("harry" AND "p") rather than "harry p".
Fixed: #70