Accessing _score in the filter of aggregations

Elastic Stack Elasticsearch
2

After additional research (source code of ES) I've found out that the Range aggregator also has access to the _score. Below an example that solved my problem:

POST /test/_search
{
  "query": {
    "match": {
      "name": "red fox"
    }
  },
  "aggs": {
    "mostRelevantColors": {
      "range": {
          "script": {
            "source": "_score"
          },
          "ranges": [
              {
                  "from": 0.5
              }
            ]
      },
      "aggs": {
        "colors": {
          "terms": {
            "field": "color"
          }
        }
      }
    }
  }
}

Response

{
  "hits": {
    "hits": [
      {
        "_score": 0.87546873,
        "_type": "_doc",
        "_id": "l7petGgBlKKsTTjoJ0OO",
        "_source": {
          "color": "red",
          "name": "red fox"
        },
        "_index": "test"
      },
      {
        "_score": 0.18232156,
        "_type": "_doc",
        "_id": "f7pdtGgBlKKsTTjo-0O4",
        "_source": {
          "color": "white",
          "name": "arctic fox"
        },
        "_index": "test"
      }
    ],
    "total": 2,
    "max_score": 0.87546873
  },
  "_shards": {
    "successful": 1,
    "failed": 0,
    "skipped": 0,
    "total": 1
  },
  "took": 1,
  "aggregations": {
    "mostRelevantColors": {
      "buckets": [
        {
          "colors": {
            "buckets": [
              {
                "key": "red",
                "doc_count": 1
              }
            ],
            "sum_other_doc_count": 0,
            "doc_count_error_upper_bound": 0
          },
          "from": 0.5,
          "key": "0.5-*",
          "doc_count": 1
        }
      ]
    }
  },
  "timed_out": false
}