按函数结果弹性搜索顺序（sqrt）

Question

我在elastic中保存了以下数据

{
   "data" : {
       "c1" : -0.343404934,
       "c2" : -0.1234212345,
       "c3" : 0.003404934
   }
}

我需要用平方根对每个字段的功率求和进行排序。
在 sql 我会这样写：

SELECT c1,c2,c3 from table
ORDER BY sqrt( 
     power(c1 - external_param_c1, 2) + power(c2 - external_param_c2, 2) + power(c2 - external_param_c3, 2) 
)

如何将其转换为 elastic？
谢谢

Answer 1

看来你需要 scripted sort utilizing the Math painless library:

{
  "sort": [
    {
      "_script": {
        "type": "number",
        "order": "desc",
        "script": {
          "source": "Math.sqrt(Math.pow(doc['data.c1'].value - params.external_param_c1, 2) + Math.pow(doc['data.c2'].value - params.external_param_c2, 2) + Math.pow(doc['data.c3'].value - params.external_param_c3, 2))",
          "params": {
            "external_param_c1": 1,
            "external_param_c2": 2,
            "external_param_c3": 3
          }
        }
      }
      
    }
  ]
}

按函数结果弹性搜索顺序（sqrt）

elastic search order by function result (sqrt)

sorting

sqrt

elasticsearch