Add a time field in elasticsearch and calculate time between two event

[The-morpho]

I'm new to elasticsearch.

I’m working with log files stored in Elasticsearch, that contains information about some operations on differents levels, I have a field timestamp that represents the time when each operation has occured on each step.

I want to calculate the time between the start and the end of the process. between step1 and step 3 and add it to a field that I will create so I can visualize it on Kibana.

This is an exemple of some of my logs.

{“log_level”:“INFO”,“timestamp”:“2021-12-22T11:49:06.124890Z”,“event_type”:“step1”,“mid”:“96712abc”}{“log_level”:“INFO”,“timestamp”:“2021-12-22T11:49:07.124890Z”,“event_type”:“step2”,“mid”:“96712abc”} {“log_level”:“INFO”,“timestamp”:“2021-12-22T11:49:08.124890Z”,“event_type”:“step3”,“mid”:“96712abc”}