How to access sub fields in Kibana?

I want to access the sub-fields technique_id etc for visualization..
for example I want to make a pie chart of how many events are created per technique id. But I can't access those sub fields inside message field. How can I do this ?

Hey @Coder_HK, this is unfortunately a known limitation of Kibana per https://www.elastic.co/guide/en/kibana/current/nested-objects.html. We're tracking the request for this here

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