Elasticsearch Script Query - Returning multiple values on aggregation

[hyun]

Aggregation Result

"aggregations": {
      "649": {
         "doc_count_error_upper_bound": 0,
         "sum_other_doc_count": 0,
         "buckets": [
            {
               "key": "ALLOGENE THERAPEUTICS",
               "doc_count": 43
            },
            {
               "key": "CELLECTIS",
               "doc_count": 5
            },
            {
               "key": "PFIZER",
               "doc_count": 4
            }
         ]
      }
   }

Merge Aggregation Result

"aggregations": {
      "649": {
         "doc_count_error_upper_bound": 0,
         "sum_other_doc_count": 0,
         "buckets": [
            {
               "key": "STUB",   // ALLOGENE THERAPEUTICS + CELLECTIS
               "doc_count": 48
            },
            {
               "key": "PFIZER",
               "doc_count": 1
            }
         ]
      }
   }

I want to merge "ALLOGENE THERAPEUTICS" and "CELLECTIS"

And change key name to "STUB"

Therefore, I made the following query using script.

The script query language is groovy.

my_field, which is the aggregation target, is a list type.

{
  "size" : 0,
  "query" : {
    "ids" : {
      "types" : [ ],
      "values" : [ "id1", "id2", "id3", "id4" ... ]
    }
  },
  "aggregations" : {
    "649" : {
      "terms" : {
        "script" : {
          "inline" : 
              "def param = new groovy.json.JsonSlurper().parseText(
                  '{\"ALLOGENE THERAPEUTICS\": \"STUB\", \"CELLECTIS\": \"STUB\"}'
              ); 
              def data = doc['my_field'].values; 
              def list = [];
              if (!doc['my_field'].empty) {   // my_field is list type
                  for (x in data) { 
                      if (param[x] != null) { 
                          list.add(param[x]); 
                      } 
                  } 
              }; 
              if (list.isEmpty()) { 
                  return data;  // PFIZER
              } else { 
                  return list;  // list["STUB", "STUB"]
              }"
        },
        "size" : 50
      }
    }
  }
}

According to the results, 48 STUB should be printed, but 47 STUB are being printed.

"aggregations": {
      "649": {
         "doc_count_error_upper_bound": 0,
         "sum_other_doc_count": 0,
         "buckets": [
            {
               "key": "STUB",   // ALLOGENE THERAPEUTICS + CELLECTIS
               "doc_count": 47  // It has to be 48 !!
            },
            {
               "key": "PFIZER",
               "doc_count": 1
            }
         ]
      }
   }

I've tried many things, but I think there's probably a problem with the list type.

I don't think I'm bringing all the elements.

I'd appreciate it if you could give me your opinion.