I have a question about field aggregation

[zplzpl]

Category is a nested field, there are two fields, one is category_id, one is name., I now use aggregate statement, according to the ID polymerization, then the polymerization results inside can only see the key value is category_id, if I want to show the other word segment under key, such as name fields. How to write?

"category": [
              {
                 "category_id": 1,
                 "name": "category_name_1"
              },
              {
                 "category_id": 2,
                 "name": "category_name_2"
              },
              {
                 "category_id": 2,
                 "name": "category_name_3"
              }
           ]

The results:

"category": {
     "doc_count": 675,
     "category_id": {
        "doc_count_error_upper_bound": 0,
        "sum_other_doc_count": 0,
        "buckets": [
           {
              "key": 2,
              "doc_count": 450
           },
           {
              "key": 1,
              "doc_count": 225
           }
        ]
     }
  }

How to read simultaneously to category name?

[askids]

Assuming that id and category name will have a 1 to 1 mapping, just do a sub aggregation on category name under id. It will give count of unique list of category under that id. For this to work, I believe that category name will have to be defined as keyword instead of text. Just check that once.