How to access aggreagions in Elasticsearch

I want to display chart that displays documents count by date from by Elasticsearch DB.

I am using request to search with following query:

{
  "size": 0, 
  "query": {
    "bool": {
      "filter": [
        {
          "term": {
            "_index": "my-index"
          }
        }
      ], 
      "must": [
        {
          "range": {
            "created_at": {
              "gte": "now-10d/d",
              "lte": "now/d"
            }
          }
        }
      ]
    }
  }, 
  "aggs": {
    "created_histogram": {
      "date_histogram": {
        "field": "created_at",
        "calendar_interval": "day"
      }
    }
  }
}

But retool there is nothing displayed in the retool output:

Seems retool ignores any response filelds except from hits. If I set different size (size=10) - There are documents in the response. But I want to get aggregations.