ElasticSearch aggregation with filter on array item

Question

I want to do an aggregation request with some additional logic, but I'm not sure if it's possible and how to do it. When I have the following documents, how can I requests the locations in the array that do not have a "type" defined? I tried with sending a sub aggregation filter on type, but then also location "20" get doc_count 1 on that aggregation.

How can I do some logic on the matching aggregation item in this case?

Documents:

    //document1
{
        "locations": [{
                "code": "20",
                "names": [{
                        "languageCode": "en-GB",
                        "value": "Amsterdam"
                    }
                ]
            }, {
                "type": {
                    "id": 25,
                    "names": [{
                            "languageCode": "en-GB",
                            "value": "area"
                        }
                    ]
                },
                "code": "21",
                "names": [{
                        "languageCode": "en-GB",
                        "value": "Amsterdam-South"
                    }
                ]
            }
        ]
    }
//Document 2
    {
        "locations": [{
                "code": "22",
                "names": [{
                        "languageCode": "en-GB",
                        "value": "DenHague"
                    }, {
                        "languageCode": "nl-NL",
                        "value": "DenHaag"
                    }
                ]
            }
        ]
    }

Request:

{
    "aggs": {
        "Filter_Location": {
            "aggs": {
                "SubType": {
                    "filter": {
                        "exists": {
                            "field": "locations.type"
                        }
                    }
                }           },
            "terms": {
                "field": "locations.code.keyword"
            }
        }
    },
    "size": 0
}

Result:

{
    "aggregations": {
        "Filter_Location": {
            "doc_count_error_upper_bound": 0,
            "sum_other_doc_count": 0,
            "buckets": [{
                    "key": "20",
                    "doc_count": 1,
                    "SubType": {
                        "doc_count": 1
                    },
                    "groupByAccoId": {
                        "value": 1
                    }
                }, {
                    "key": "21",
                    "doc_count": 1,
                    "SubType": {
                        "doc_count": 1
                    },
                    "groupByAccoId": {
                        "value": 1
                    }
                }, {
                    "key": "22",
                    "doc_count": 1,
                    "SubType": {
                        "doc_count": 0
                    },
                    "groupByAccoId": {
                        "value": 1
                    }
                }
            ]
        }
    }
}

Expected Result:

{
    "aggregations": {
        "Filter_Location": {
            "doc_count_error_upper_bound": 0,
            "sum_other_doc_count": 0,
            "buckets": [{
                    "key": "20",
                    "doc_count": 1,
                    "SubType": {
                        "doc_count": 0
                    }
                }, {
                    "key": "21",
                    "doc_count": 1,
                    "SubType": {
                        "doc_count": 1
                    }
                }, {
                    "key": "22",
                    "doc_count": 1,
                    "SubType": {
                        "doc_count": 0
                    }
                }
            ]
        }
    }
}

Jozef - Spatialized.io · Accepted Answer · 2020-10-26 11:10:44Z

In order to prevent the locations array flattening you'll need to set your index mapping as nested:

PUT ind
{
  "mappings": {
    "properties": {
      "locations": {
        "type": "nested"
      }
    }
  }
}

After ingesting the docs this query will fetch you the desired results:

GET ind/_search
{
  "size": 0,
  "aggs": {
    "Filter_Location_parent": {
      "nested": {
        "path": "locations"
      },
      "aggs": {
        "Filter_Location": {
          "terms": {
            "field": "locations.code.keyword"
          },
          "aggs": {
            "SubType": {
              "filter": {
                "exists": {
                  "field": "locations.type"
                }
              }
            }
          }
        }
      }
    }
  }
}

hmm, @Joe do you know if it's possible to add a cardinality aggregation on a field outside the nested property?
Not if you're still inside the nested context. Unless you use reverse_nested.

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