Kibana - a graph with deltas between two fields of two different documents

Question

I use the ELK stack to monitor many Java services, and more precisely, I use the input JST file to enter data into Elasticearch.

In one of them, I get the number of messages received by my service since the service started. So this is an incremental value, and I would like to create a graph with the number of received messages / seconds.

In the source data, I have the following data:

  {
      "metric_value_number": 1633157,
      "hostname": "server1",
      "metricsName": "ExchangesCompleted"
  },
  {
      "metric_value_number": 1633811,
      "hostname": "server1",
      "metricsName": "ExchangesCompleted"
  },
  {
      "metric_value_number": 1634512,
      "hostname": "server1",
      "metricsName": "ExchangesCompleted"
  }

I would like for each document to calculate the delta between its value and the value of the document in front of it.

In my example, I want:

    1633157 - 0 = 1633157
    1633811 - 1633157 = 654
    1634512 - 1633811 = 701

And draw the result of this operation.

I can not find a way to do this. Most of the time, people use the script field in the kiban, but they always perform the operation between the fields of the SELF document, and I want to do this with another document.

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