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

Question

How can I add a new key called \'agency_name\' in my output bucket.

I am running an aggregation code as shown below

{
  \"aggs\": {
    \"name\": {
             


        

Answer 1

What I do is use something like the following query:

"aggs" : {
    "products" : {
      "filter" : { "term": { "item.category": "children" }},
      "aggs" : {
        "count" : {
          "terms" : {
            "script": "doc['item.id'].value + ':' + doc['item.name'].value"
          }
        }
      }
    }
  }

Which returns something like this:

...
"aggregations" : {
    "products" : {
      "doc_count" : 1050,
      "count" : {
        "doc_count_error_upper_bound" : 0,
        "sum_other_doc_count" : 0,
        "buckets" : [
          {
            "key" : "x2_90QBj9k:Baby Oil",
            "doc_count" : 45
          },
          ...
        ]
...

And then I can use a string operation on bucket[i]["key"], for each i in a loop, to extract the relevant field.