Is there any way in Elasticsearch to get results as CSV file in curl API?

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I’ve done just this using cURL and jq (“like sed, but for JSON”). For example, you can do the following to get CSV output for the top 20 values of a given facet:

$ curl -X GET 'http://localhost:9200/myindex/item/_search?from=0&size=0' -d '
    {"from": 0,
    "size": 0,
    "facets": {
      "sourceResource.subject.name": {
        "global": true,
        "terms": {
          "order": "count",
          "size": 20,
          "all_terms": true,
          "field": "sourceResource.subject.name.not_analyzed"
        }
      }
    },
    "sort": [
      {
        "_score": "desc"
      }
    ],
    "query": {
      "filtered": {
        "query": {
          "match_all": {}
        }
      }
    }
  }' | jq -r '.facets["subject"].terms[] | [.term, .count] | @csv'

"United States",33755
"Charities--Massachusetts",8304
"Almshouses--Massachusetts--Tewksbury",8304
"Shields",4232
"Coat of arms",4214
"Springfield College",3422
"Men",3136
"Trees",3086
"Session Laws--Massachusetts",2668
"Baseball players",2543
"Animals",2527
"Books",2119
"Women",2004
"Landscape",1940
"Floral",1821
"Architecture, Domestic--Lowell (Mass)--History",1785
"Parks",1745
"Buildings",1730
"Houses",1611
"Snow",1579

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