title: elasticsearch autosuggest fetch only text data
body: <p>I am new to elasticsearch.Now I am using elasticsearch5.6.</p>
  
  <p>POST localhost:9200/hotels/_suggest</p>
  
  <p>req-body: {
    "hotels" : {
      "text" : "m",
      "completion" : {
        "field" : "name_suggest"
      }
    }
  }</p>
  
  <p>response</p>
  
  <pre><code>{
      "_shards": {
          "total": 5,
          "successful": 5,
          "skipped": 0,
          "failed": 0
      },
      "hotels": [
          {
              "text": "m",
              "offset": 0,
              "length": 1,
              "options": [
                  {
                      "text": "Marriot Munich City",
                      "_index": "hotels",
                      "_type": "hotel",
                      "_id": "3",
                      "_score": 1,
                      "_source": {
                          "name": "Courtyard by Marriot Munich City",
                          "city": "Munich",
                          "name_suggest": {
                              "input": [
                                  "Courtyard by Marriot Munich City",
                                  "Marriot Munich City"
                              ]
                          }
                      }
                  },
                  {
                      "text": "Monaco Munich",
                      "_index": "hotels",
                      "_type": "hotel",
                      "_id": "1",
                      "_score": 1,
                      "_source": {
                          "name": "Hotel Monaco",
                          "city": "Munich",
                          "name_suggest": {
                              "input": [
                                  "Monaco Munich",
                                  "Hotel Monaco"
                              ]
                          }
                      }
                  }
              ]
          }
      ]
  }
  </code></pre>
  
  <p>Is there any way , where I can exclude _source in response? </p>
  
  <p>Thanks in advance.</p>