在Elasticsearch中按汇总字段对匹配进行排序

如何解决在Elasticsearch中按汇总字段对匹配进行排序

Elasticsearch版本：5.6.16，lucene_version：6.6.1

我想按Elasticsearch中的聚合字段对匹配进行排序。

我要排序的字段是存储桶聚合group_by_item_id中的 savings_pct 。

有没有一种方法可以将字段放入“ _source”，以便我可以在排序脚本中使用它？

请注意，查询示例中的重要位是“ group_by_item_id”，“ _ source”和“ sort”

{
    "query": {
        "bool": {
            "must": [],"should": [],"filter": [
                {
                    "terms": {
                        "item_type": [
                            "helmets_clothes"
                        ]
                    }
                }
                
            ]
        }
    },"aggs": {
        "min_price_eur": {
            "min": {
                "field": "item_price_eur","missing": 0
            }
        },"max_price_eur": {
            "max": {
                "field": "item_price_eur","group_by_item_id": {
            "terms": {
                "field": "same_item_id","size": 100
            },"aggs": {
                "average_price": {
                    "avg": {
                        "field": "item_price_eur"
                    }
                },"min_price": {
                    "min": {
                        "field": "item_price_eur"
                    }
                },"savings_pct": {
          "bucket_script": {
            "buckets_path": {
              "avg_price": "average_price","total_prices": "_count","min_price": "min_price"
                            
            },"script": "100-(params.min_price / params.avg_price) * 100"
          }
        }
            }
        }
    },"_source": [
        "item_url"
    ],"sort": [
                {
            "_script" : {
            "type" : "number","script" : {
                                "lang": "painless","inline": "doc['prices_count'].value == 5 ? 100 - (doc['min_price_eur'].value / doc['max_price_eur'].value) * 100 : 0"
            },"order" : "asc"
                    }
                }
    ]
}