anchor.diff:          "completion" : {
               "field" : "suggest",
               "size": 10,
  -            "context": {
  +            "contexts": {
                   "location": {
                       "lat": 43.662,
                       "lon": -79.380
  
positive.code: {
      "suggest": {
          "input": "timmy's",
          "context": [
              "location": [
                  {
                      "lat": 43.6624803,
  
negative.code:     ...
      "suggest": {
          "input": ["timmy's", "starbucks", "dunkin donuts"],
          "contexts": {
              "place_type": ["cafe", "food"] <1>
          }
      }
  