anchor.diff:  --------------------------------------------------
   // CONSOLE
   // TEST[continued]
  +
  +<1> Filter the source to return only the `suggest` field
  +<2> Name of the field to search for suggestions in
  +<3> Number of suggestions to return
   
   Which should look like:
   
  
positive.code: {
      "suggest": {
          "song-suggest" : {
              "prefix" : "nir",
              "completion" : {
                  "field" : "suggest"
              }
          }
      }
  
negative.code: 
  [source,js]
  --------------------------------------------------
  POST music/_search
  {
      "_source": "suggest", <1>
      "suggest": {
          "song-suggest" : {
              "prefix" : "nir",
              "completion" : {
                  "field" : "suggest", <2>
                  "size" : 5 <3>
              }
          }
      }
  