Correlation or calculating time difference between log entries using BI tool with ES 6.5

Elastic Stack Elasticsearch
1

Some jobs create log entries as following:
event time( start), uid and status;
event time( stop), uid and status;

The message if parsed and the fields are separated using Logstash and put into index.

I believe I could not show on Kibana, the average running time of job and top jobs that take more time even though they are put into same index.

Can I use ES as data store and use external BI tool to project such kind of visualization.

2

Or you can use this may be? https://www.elastic.co/guide/en/logstash/current/plugins-filters-aggregate.html

3

One could also use https://www.elastic.co/guide/en/logstash/current/plugins-filters-elapsed.html. Can calculate difference between timestamps in the log entries right.