gistfile1.txt

################################
## THIS WORKS AS EXPECTED
################################
DELETE place

### create cat field as text type
PUT place
{
  "mappings": {
    "shops": {
      "properties": {
        "suggest": {
          "type": "completion",
          "contexts": [
            {
              "name": "place_type",
              "type": "category",
              "path": "cat"
            }
          ]
        },
        "cat":{
          "type": "text"
        }
      }
    }
  }
}

PUT place/shops/1
{
    "suggest": ["timmy's", "starbucks", "dunkin donuts"],
    "cat": ["cafe", "food"] 
}

## This returns contexts "cafe" and "food" as expected
GET place/_search
{
  "suggest": {
    "place_suggestion": {
      "prefix": "tim",
      "completion": {
        "field": "suggest",
        "contexts": {
        }
      }
    }
  }
}

################################
## THIS DOESN'T WORK
################################
DELETE place

### create cat field as text type
PUT place
{
  "mappings": {
    "shops": {
      "properties": {
        "suggest": {
          "type": "completion",
          "contexts": [
            {
              "name": "place_type",
              "type": "category",
              "path": "cat"
            }
          ]
        },
        "cat":{
          "type": "keyword"
        }
      }
    }
  }
}

PUT place/shops/1
{
    "suggest": ["timmy's", "starbucks", "dunkin donuts"],
    "cat": ["cafe", "food"] 
}

## This returns contexsts as null
GET place/_search
{
  "suggest": {
    "place_suggestion": {
      "prefix": "tim",
      "completion": {
        "field": "suggest",
        "contexts": {
        }
      }
    }
  }
}