如何使用弹性搜索查询对象的键？

Question

Hi my data is structured in the following manner:

student{
 subjects{
   biology:{
     0: "A2-Level"
     1:"AS-Level"
     2:"University"
  }
 }
}

My main index is at student, therefore my properties are as follows

"mappings":{"student":{"properties":{"subjects":{"type":"nested","properties":{"biology":{"type":"string"},"english":{"type":"string"}}}

Im currently doing this search :

    var query = {
          index: 'firebase',
          type: 'student',
          "body": {
            "query": {
              "bool": {
                "must": [ 
       {
        "nested": {
          "path": "subjects",
          "query": {
            "bool": {
              "must": [
                { "exists": { "field": english } }
              ]
            }
          }
        }
      }

    ]

to return the students that are studying english. However nothing is being returned? Can anyone suggest where I am going wrong?

Answer 1

You should check for subjects.english field instead of english So, your query should look something like this:

{
"query": {
  "bool": {
     "must": [
        {
           "nested": {
              "path": "subjects",
              "query": {
                 "bool": {
                    "must": [
                       {
                          "exists": {
                             "field": "subjects.english"
                          }
                       }
                    ]
                 }
              }
           }
        }
     ]
  }
 }
}