Math operation on different documents/queries

Elastic Stack Kibana
1

Hi,

I'm trying to create metric in Kibana dashboard(Lens), where i will see difference between two different fields (events_passed - events_all) (subtraction)

That fields are available in two different documents

Can i make some aggregation? to calculate difference?

I'm able to get required fields by two queries

events_all :

{
  "_source": ["events_all"], 
  "query": {
    "bool": {
      "must": [],
      "filter": [
        {
          "range": {
            "@timestamp": {
              "format": "strict_date_optional_time",
              "gte": "now-15m",
              "lte": "now"
            }
          }
        },
        {
          "match_phrase": {
            "app_name": "app1"
          }
        },
        {
          "match_phrase": {
            "imsi_prefix": "00002"
          }
        }
      ]
    }
  }
}

events_passed

{
  "size": 1, 
  "_source": ["events_passed"], 
  "query": {
    "bool": {
      "must": [],
      "filter": [
        {
          "range": {
            "@timestamp": {
              "format": "strict_date_optional_time",
              "gte": "now-15m",
              "lte": "now"
            }
          }
        },
        {
          "match_phrase": {
            "app_name": "app1"
          }
        },
        {
          "exists": {
            "field": "events_passed"
          }
        }
      ],
      "should": [],
      "must_not": []
    }
  }
}

Sample docs

{
  "_index": "app1_log-001745",
  "_type": "_doc",
  "_id": "KKha9oQBIhZIlNHKrDlX",
  "_version": 1,
  "_score": 1,
  "_source": {
    "app_name": "app1",
    "events_all": "14928046",
    "@version": "1",
    "executed_time": 7.331166666666666,
    "events_rejected": "5869684",
    "events_passed": "9058362", - Field1
    "log_level": "INFO"
  }
}


{
  "_index": "app_log-001745",
  "_type": "_doc",
  "_id": "7C6R9oQBIhZIlNHK1xU7",
  "_version": 1,
  "_score": 1,
  "_source": {
    "imsi_prefix": "00002",
    "log_level": "DEBUG",
    "app_name": "app1",
    "events_all": "8252891", - Field2
    "@version": "1",
  }
}

Expected result : 9058362(Field1) - 8252891(Field2) = 805471

How can I deal with it ?
Elasticsearch/Kibana 7.16

Regards

2

Anyone can help?

3

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