Count number of inner elements of array property (Including repeated values)

Question

Given I have the following records.

[
    {
        "profile": "123",
        "inner": [
            {
                "name": "John"
            }
        ]
    },
    {
        "profile": "456",
        "inner": [
            {
                "name": "John"
            },
            {
                "name": "John"
            },
            {
                "name": "James"
            }
        ]
    }
]

I want to get something like:

"aggregations": {
    "name": {
        "buckets": [
            {
                "key": "John",
                "doc_count": 3
            },
            {
                "key": "James",
                "doc_count": 1
            }
        ]
    }
}

I'm a beginner using Elasticsearch, and this seems to be a pretty simple operation to do, but I can't find how to achieve this.
If I try a simple aggs using term, it returns 2 for John, instead of 3. Example request I'm trying:

{
  "size": 0,
  "aggs": {
    "name": {
      "terms": {
        "field": "inner.name"
      }
    }
  }
}

How can I possibly achieve this?
Additional Info: It will be used on Kibana later. I can change mapping to whatever I want, but AFAIK Kibana doesn't like the "Nested" type. :(

Benjamin Trent · Accepted Answer · 2021-10-28 12:04:59Z

5

You need to do a value_count aggregation, by default terms only does a doc_count, but the value_count aggregation will count the number of times a given field exists.

So, for your purposes:

{
  "size": 0,
  "aggs": {
    "name": {
      "terms": {
        "field": "inner.name"
      },
      "aggs": {
        "total": {
          "value_count": {
            "field": "inner.name"
          }
        }
      }
    }
  }
}

Which returns:

"aggregations" : {
    "name" : {
      "doc_count_error_upper_bound" : 0,
      "sum_other_doc_count" : 0,
      "buckets" : [
        {
          "key" : "John",
          "doc_count" : 2,
          "total" : {
            "value" : 3
          }
        },
        {
          "key" : "James",
          "doc_count" : 1,
          "total" : {
            "value" : 2
          }
        }
      ]
    }
  }

answered Oct 28, 2021 at 12:04

Benjamin Trent

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3 Comments

Pedro Kehl Over a year ago

Thank you, that works perfectly. Do you by any chance know how can I achieve this in a Kibana chart as well?

Benjamin Trent Over a year ago

This seems like a different question. It depends on the visualization and I am not 100% how you want it visualized.

Pedro Kehl Over a year ago

It would actually be a data table, just to have the count by name in the same dashboard of everything else. And yes, I understand it should be another question. sorry for the confusion.

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