Elasticsearch Simple place autocomplete

{  
  "settings":{  
    "analysis":{  
      "filter":{  
        "nGram_filter":{  
          "type":"nGram",
          "min_gram":1,
          "max_gram":20,
          "token_chars":[  
            "letter",
            "digit",
            "punctuation",
            "symbol"
          ]
        }
      },
      "analyzer":{  
        "nGram_analyzer":{  
          "type":"custom",
          "tokenizer":"whitespace",
          "filter":[  
            "lowercase",
            "nGram_filter"
          ]
        },
        "whitespace_analyzer":{  
          "type":"custom",
          "tokenizer":"whitespace",
          "filter":[  
            "lowercase"
          ]
        }
      }
    }
  },
  "mappings":{  
    "area":{  
      "_all":{  
        "analyzer":"nGram_analyzer",
        "search_analyzer":"whitespace_analyzer"
      },
      "properties":{  
        "full_name":{  
          "analyzer":"nGram_analyzer",
          "search_analyzer":"whitespace_analyzer",
          "type":"text"
        }
      }
    }
  }
}

Query

{"query": %{
    "bool": {
      "should": [
        {"match": {"full_name": params[:filter][:q]}},
      ],
      "filter": [
        { "term":  { "level": "place" }},
      ]
    }
  }
})