ElasticSearch按嵌套文档之和筛选

Question

{
  "product": {
    "properties": {
      "warehouses": {
        "type": "nested",
        "properties": {
          "stock_level": {
            "type": "integer"
          }
        }
      }
    }
  }
}

{
  "id": 1,
  "warehouses": [
    {
      "id": 2001,
      "stock_level": 5
    },
    {
      "id": 2002,
      "stock_level": 0
    },
    {
      "id": 2003,
      "stock_level": 2
    }
  ]
}

GET products/_search
{
  "query": {
    "bool": {
      "filter": [
        [
          {
            "script": {
              "script": {
                "source": """
int total = 0;
for (def warehouse: params['_source']['warehouses']) {
  if (params.warehouse_ids == null || params.warehouse_ids.contains(warehouse.id)) {
    total += warehouse.stock_level;
  }
}
boolean gte = true;
boolean lte = true;
if (params.gte != null) {
  gte = (total >= params.gte);
}
if (params.lte != null) {
  lte = (total <= params.lte);
}
return (gte && lte);

""",
                "lang": "painless",
                "params": {
                  "gte": 4
                }
              }
            }
          }
        ]
      ]
    }
  }
}

null

我也尝试使用scripted_field，但是脚本字段似乎是在最后一个阶段计算的，在查询过程中不可用。

我也有一个按照相同逻辑进行排序的方法（根据给定仓库中库存的总和对产品进行排序），它像一个魅力一样工作：

  "sort": {
    "warehouses.stock_level": {
      "order": "desc",
      "mode": "sum",
      "nested": {
        "path": "warehouses"
        "filter": {
           "terms": {
             "warehouses.id": [2001, 2003]
           }
        }
      }
    }
  }

但我也找不到访问此排序值的方法：（

Answer 1

我最近也有同样的问题。事实证明，在重构过程中，更改发生在6.4左右的某个地方，虽然强烈不鼓励访问_source，但看起来人们仍然在使用/希望使用它。

这里有一个利用include_in_root参数的变通方法。

1. 调整映射

PUT product
{
  "mappings": {
    "properties": {
      "warehouses": {
        "type": "nested",
        "include_in_root": true,     <--
        "properties": {
          "stock_level": {
            "type": "integer"
          }
        }
      }
    }
  }
}

GET product/_search
{
  "query": {
    "bool": {
      "filter": [
        {
          "script": {
            "script": {
              "source": """
                  int total = 0;
                  
                  def ids = doc['warehouses.id'];
                  def levels = doc['warehouses.stock_level'];
                  
                  for (def i = 0; i <  ids.length; i++) {
                    def warehouse = ['id':ids[i], 'stock_level':levels[i]];
                    
                    if (params.warehouse_ids == null || params.warehouse_ids.contains(warehouse.id)) {
                      total += warehouse.stock_level;
                    }
                  }
                  
                  boolean gte = true;
                  boolean lte = true;
                  if (params.gte != null) {
                    gte = (total >= params.gte);
                  }
                  if (params.lte != null) {
                    lte = (total <= params.lte);
                  }
                  return (gte && lte);
              """,
              "lang": "painless",
              "params": {
                  "gte": 4
              }
            }
          }
        }
      ]
    }
  }
}