Aggregating full text fields

I'm trying to display the number of markets in an index. Each document has a field called market and I want aggregate the results like this:

"Advertising and sales" : 400

"Oil Industry" : 250

"Metal Industry" : 125
I know how to display these results using the query:

"aggs":{
  "group_by_market":{
    "terms":{
      "field": "market"
    }
  }
}

The problem is that when they are displayed; they don't get displayed correctly. The markets are displayed separately. For example:

"Advertising": 400

"Sales": 400

"Oil": 322

...etc
How do I make it so the markets are aggregated with all the text?

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