Aggregations sorting (between them, not in their results) changes from ES7 to ES8?

Elastic Stack Elasticsearch
1

Hi !
In our application, we use aggregations using this kind of syntax:

"aggs": {
    "question_1.answer.id": {
      "terms": {
        "field": "question_1.answer.id",
        "size": 20000
      },
      "aggs": {
        "id": {
          "terms": {
            "field": "id",
            "size": 20000
          }
        }
      }
    },
    "question_2.answer.id": {
      "terms": {
        "field": "question_2.answer.id",
        "size": 20000
      },
      "aggs": {
        "id": {
          "terms": {
            "field": "id",
            "size": 20000
          }
        }
      }
    },
    "question_3.answer.id": {
      "terms": {
        "field": "question_3.answer.id",
        "size": 20000
      },
      "aggs": {
        "id": {
          "terms": {
            "field": "id",
            "size": 20000
          }
        }
      }
    },

In ES7, the aggregations in the result were ordered by a strange order (question_99, question_16, etc)
In ES8, the aggregations names are "naturally" ordered (question_1, question_2, etc)

Is it a setting in configuration ?

Thanks