ElasticSearch - How to display an additional field name in aggregation query -

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how can add new key called 'agency_name' in output bucket.

i running aggregation code shown below

{   "aggs": {     "name": {       "terms": {         "field": "agency_code"       }     }   } }

i getting out put as

"aggregations": {     "name": {         "doc_count_error_upper_bound": 130,         "sum_other_doc_count": 39921,         "buckets": [             {                 "key": "1000",                 "doc_count": 105163             },             {                 "key": "2100",                 "doc_count": 43006             }         ]     } }

while displaying need show agency name, code , doc_count

how can modify aggregation query below format. new elasticsearch, not sure how fix 

"aggregations": {     "name": {         "doc_count_error_upper_bound": 130,         "sum_other_doc_count": 39921,         "buckets": [             {                 "key": "1000",                 "doc_count": 105163,                 "agency_name": 'agent 1'             },             {                 "key": "2100",                 "doc_count": 43006,                 "agency_name": 'agent 2'             }         ]     } }

sample data in elasticsearch (fields analysed)

{      "_index": "feeds",     "_type": "news",     "_id": "22005",     "_version": 1,     "_score": 1,     "_source": {         "id": 22005,         "name": "test news",         "agency_name": "agent 1",         "agency_code": "1000",     }  }

you can use top hits aggregation in link below. format different since creating aggregation embed agency name under 'hits' key.

adding additional fields elasticsearch terms aggregation

{   "aggs": {     "name": {       "terms": {         "field": "agency_code"       },       "aggs": {         "agency_names" : {            "top_hits": {                 size: 1,                  _source: {                     include: ['agency_name']                 }             }          }         }     }   } }

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