使用join查询，现查询子文档，怎么返回子文档相应的父文档呢？

加个 inner_hits: https://www.elastic.co/guide/e ... .html

DELETE my_index

#1、create index

PUT my_index

{

  "mappings": {

    "properties": {

      "my_join_field": { 

        "type": "join",

        "relations": {

          "question": "answer" 

        }

      }

    }

  }

}



# 2、new add parent document

PUT my_index/_doc/1?refresh

{

  "text": "This is a question",

  "my_join_field": {

    "name": "question" 

  }

}



PUT my_index/_doc/2?refresh

{

  "text": "This is another question",

  "my_join_field": {

    "name": "question"

  }

}



# 3、create child document

PUT my_index/_doc/3?routing=1&refresh

{

  "text": "This is an answer",

  "my_join_field": {

    "name": "answer", 

    "parent": "1" 

  }

}



PUT my_index/_doc/4?routing=1&refresh

{

  "text": "This is another answer",

  "my_join_field": {

    "name": "answer",

    "parent": "1"

  }

}





GET my_index/_mapping

#4、get child document by parent document

GET my_index/_search

{

    "query": {

        "has_parent" : {

            "parent_type" : "question",

            "query" : {

               "match_phrase": {

                 "text": "This is a question"

               }

            },

             "inner_hits": {}   

        }

    }

}