Average of list lengths in documents using Json Input

Elastic Stack Kibana
1

I would like to take an average of lengths using the json input for a document.

Let's say the documents are structured as follows

{
  "@timestamp" : "<TIMESTAMP>",
  "items" : [
    { "a" : 1 },
    { "b" : 2 },
    { "c" : 13 }
  ]
}

Then i would like to make a visualisation to take the average length of all the items.

How would I set the aggregation and Json input?

I believe the Json Input would be:

{"script" : "doc['items'].value.length()" }

But when I choose average I have to choose a field, which I am trying to supply with the Json Input, i.e. the length of the items list to be averaged.

2

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