Sorting issue

I have a requirement where in I would need to sort the parent bucket ('d1' here) based on the values calculated in an innermost bucket ('percentage' key within udate[0]). Please find my Elasticsearch query below. Thank you in advance.!

{
"query": {
"bool": {
"must": [{
"range": {
"date": {
"gte": "27/10/2018 00:00:00"

				}
			}
		}]
	}
},
"aggs": {
	"d1": {
		"terms": {
			"field": "d.keyword",
			"size": 100
		},
		"aggs": {
			"udate": {
				"terms": {
					"field": "date",
					"size": 10
				},
				"aggs": {
					"value_count": {
						"value_count": {
							"field": "status.keyword"
						}
					},
					"filterStatus": {
						"filter": {
							"prefix": {
								"status": "4"
							}
						},
						"aggs": {
							"error_count": {
								"value_count": {
									"field": "status.keyword"
								}
							}
						}
					},
					"percentage": {
						"bucket_script": {
							"buckets_path": {
								"errorCount": "filterStatus>error_count",
								"totalCount": "value_count"
							},
							"script": "params.errorCount/params.totalCount * 100"
						}
					}
				}
			}
		}
	}
},
"size": 0

}

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