Elasticsearch - parent-child inner hits, multi level relations

es-6.json

// Inner hits, has_child query
GET /department/_search >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
{
  "query": {
    "has_child": {
      "type": "employee",
      "inner_hits": {},
      "query": {
        "bool": {
          "must": [
            {
              "range": {
                "age": {
                  "gte": 10
                }
              }
            }
          ],
          "should": [
            {
              "term": {
                "gender.keyword": "M"
              }
            }
          ]
        }
      }
    }
  }
}

{
  "took" : 1,
  "timed_out" : false,
  "_shards" : {
    "total" : 1,
    "successful" : 1,
    "skipped" : 0,
    "failed" : 0
  },
  "hits" : {
    "total" : {
      "value" : 2,
      "relation" : "eq"
    },
    "max_score" : 1.0,
    "hits" : [
      {
        "_index" : "department",
        "_type" : "_doc",
        "_id" : "1",
        "_score" : 1.0,
        "_source" : {
          "name" : "Development",
          "join_field" : "department"
        },
        "inner_hits" : {
          "employee" : {
            "hits" : {
              "total" : {
                "value" : 2,
                "relation" : "eq"
              },
              "max_score" : 1.1335313,
              "hits" : [
                {
                  "_index" : "department",
                  "_type" : "_doc",
                  "_id" : "3",
                  "_score" : 1.1335313,
                  "_routing" : "1",
                  "_source" : {
                    "name" : "Bo Andersen",
                    "age" : 28,
                    "gender" : "M",
                    "join_field" : {
                      "name" : "employee",
                      "parent" : 1
                    }
                  }
                },
                {
                  "_index" : "department",
                  "_type" : "_doc",
                  "_id" : "5",
                  "_score" : 1.1335313,
                  "_routing" : "1",
                  "_source" : {
                    "name" : "James Evans",
                    "age" : 32,
                    "gender" : "M",
                    "join_field" : {
                      "name" : "employee",
                      "parent" : 1
                    }
                  }
                }
              ]
            }
          }
        }
      },
      {
        "_index" : "department",
        "_type" : "_doc",
        "_id" : "2",
        "_score" : 1.0,
        "_source" : {
          "name" : "Marketing",
          "join_field" : "department"
        },
        "inner_hits" : {
          "employee" : {
            "hits" : {
              "total" : {
                "value" : 1,
                "relation" : "eq"
              },
              "max_score" : 1.1335313,
              "hits" : [
                {
                  "_index" : "department",
                  "_type" : "_doc",
                  "_id" : "4",
                  "_score" : 1.1335313,
                  "_routing" : "2",
                  "_source" : {
                    "name" : "John Doe",
                    "age" : 44,
                    "gender" : "M",
                    "join_field" : {
                      "name" : "employee",
                      "parent" : 2
                    }
                  }
                }
              ]
            }
          }
        }
      }
    ]
  }
}

// Inner hits, has_parent
GET /department/_search
{
  "query": {
    "has_parent": {
      "inner_hits": {},
      "parent_type": "department",
      "query": {
        "term": {
          "name.keyword": "Development"
        }
      }
    }
  }
}

{
  "took" : 1,
  "timed_out" : false,
  "_shards" : {
    "total" : 1,
    "successful" : 1,
    "skipped" : 0,
    "failed" : 0
  },
  "hits" : {
    "total" : {
      "value" : 2,
      "relation" : "eq"
    },
    "max_score" : 1.0,
    "hits" : [
      {
        "_index" : "department",
        "_type" : "_doc",
        "_id" : "3",
        "_score" : 1.0,
        "_routing" : "1",
        "_source" : {
          "name" : "Bo Andersen",
          "age" : 28,
          "gender" : "M",
          "join_field" : {
            "name" : "employee",
            "parent" : 1
          }
        },
        "inner_hits" : {
          "department" : {
            "hits" : {
              "total" : {
                "value" : 1,
                "relation" : "eq"
              },
              "max_score" : 1.3862942,
              "hits" : [
                {
                  "_index" : "department",
                  "_type" : "_doc",
                  "_id" : "1",
                  "_score" : 1.3862942,
                  "_source" : {
                    "name" : "Development",
                    "join_field" : "department"
                  }
                }
              ]
            }
          }
        }
      },
      {
        "_index" : "department",
        "_type" : "_doc",
        "_id" : "5",
        "_score" : 1.0,
        "_routing" : "1",
        "_source" : {
          "name" : "James Evans",
          "age" : 32,
          "gender" : "M",
          "join_field" : {
            "name" : "employee",
            "parent" : 1
          }
        },
        "inner_hits" : {
          "department" : {
            "hits" : {
              "total" : {
                "value" : 1,
                "relation" : "eq"
              },
              "max_score" : 1.3862942,
              "hits" : [
                {
                  "_index" : "department",
                  "_type" : "_doc",
                  "_id" : "1",
                  "_score" : 1.3862942,
                  "_source" : {
                    "name" : "Development",
                    "join_field" : "department"
                  }
                }
              ]
            }
          }
        }
      }
    ]
  }
}

// Multi level mapping
PUT /company
{
  "mappings": {
    "properties": {
      "join_field": { 
        "type": "join",
        "relations": {
          "company": ["department", "supplier"],
          "department": "employee"
        }
      }
    }
  }
}

{
  "acknowledged" : true,
  "shards_acknowledged" : true,
  "index" : "company"
}

PUT /company/_doc/1
{
  "name": "My Company Inc.",
  "join_field": "company"
}

{
  "_index" : "company",
  "_type" : "_doc",
  "_id" : "1",
  "_version" : 1,
  "result" : "created",
  "_shards" : {
    "total" : 2,
    "successful" : 2,
    "failed" : 0
  },
  "_seq_no" : 0,
  "_primary_term" : 1
}

PUT /company/_doc/2?routing=1
{
  "name": "Development",
  "join_field": {
    "name": "department",
    "parent": 1
  }
}

{
  "_index" : "company",
  "_type" : "_doc",
  "_id" : "2",
  "_version" : 1,
  "result" : "created",
  "_shards" : {
    "total" : 2,
    "successful" : 2,
    "failed" : 0
  },
  "_seq_no" : 1,
  "_primary_term" : 1
}

PUT /company/_doc/3?routing=1
{
  "name": "Bo Andersen",
  "join_field": {
    "name": "employee",
    "parent": 2
  }
}

{
  "_index" : "company",
  "_type" : "_doc",
  "_id" : "3",
  "_version" : 1,
  "result" : "created",
  "_shards" : {
    "total" : 2,
    "successful" : 2,
    "failed" : 0
  },
  "_seq_no" : 2,
  "_primary_term" : 1
}

PUT /company/_doc/4
{
  "name": "Another Company, Inc.",
  "join_field": "company"
}

{
  "_index" : "company",
  "_type" : "_doc",
  "_id" : "4",
  "_version" : 1,
  "result" : "created",
  "_shards" : {
    "total" : 2,
    "successful" : 2,
    "failed" : 0
  },
  "_seq_no" : 3,
  "_primary_term" : 1
}

PUT /company/_doc/5?routing=4
{
  "name": "Marketing",
  "join_field": {
    "name": "department",
    "parent": 4
  }
}

{
  "_index" : "company",
  "_type" : "_doc",
  "_id" : "5",
  "_version" : 1,
  "result" : "created",
  "_shards" : {
    "total" : 2,
    "successful" : 2,
    "failed" : 0
  },
  "_seq_no" : 6,
  "_primary_term" : 1
}

PUT /company/_doc/6?routing=4
{
  "name": "John Doe",
  "join_field": {
    "name": "employee",
    "parent": 5
  }
}

{
  "_index" : "company",
  "_type" : "_doc",
  "_id" : "6",
  "_version" : 1,
  "result" : "created",
  "_shards" : {
    "total" : 2,
    "successful" : 2,
    "failed" : 0
  },
  "_seq_no" : 7,
  "_primary_term" : 1
}

// Querying multi level relations
GET /company/_search >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
{
  "query": {
    "has_child": {
      "type": "department",
      "query": {
        "has_child": {
          "type": "employee",
          "query": {
            "term": {
              "name.keyword": "John Doe"
            }
          }
        }
      }
    }
  }
}

{
  "took" : 609,
  "timed_out" : false,
  "_shards" : {
    "total" : 1,
    "successful" : 1,
    "skipped" : 0,
    "failed" : 0
  },
  "hits" : {
    "total" : {
      "value" : 1,
      "relation" : "eq"
    },
    "max_score" : 1.0,
    "hits" : [
      {
        "_index" : "company",
        "_type" : "_doc",
        "_id" : "4",
        "_score" : 1.0,
        "_source" : {
          "name" : "Another Company, Inc.",
          "join_field" : "company"
        }
      }
    ]
  }
}