Elasticsearch按嵌套对象计数排序

Question

我有以下ES内容，基本上是网站中包含嵌套商品的产品列表。

{
"product": {
  "ean": "abc",
  "features": {
     "product_type": "DVD player"
  },
  "color": "Black",
  "manufacturer": "Sony",
  "sitedetails": [
     {
        "name": "amazon.com",
        "sku": "zzz",
        "url": "http://www.amazon.com/dp/zzz"
     },
     {
        "name": "bestbuy.com",
        "sku": "aaa",
        "url": "http://www.bestbuy.com/aaa"
     }
  ],
  "category": "Portable DVD Players"
 },
 product: { etc etc},
 product: { etc etc},
}

如何按站点详细信息的数量排序？

tnx！

Answer 1

从问题的示例来看，它看起来像是单个文档，但是单个json文档不可能在同一级别具有相同名称的多个字段。

因此，假设每个product字段代表一个不同的顶级文档

{
  "size": 10,
  "from": 0,
  "query": {
    "match_all": {} 
  },
  "sort" : {
    "_script" : {
      "script": "doc['sitedetails'].values.size()",
      "order": "desc",
      "type" : "number"
    }
  }
}