Hi there. I am using Elasticsearch 7.9.1 + Kibana 7.9.1. I was able to create and manage drilldowns for Line Charts and Pie Charts but not for TSVB and Timelion visualizations.
Unfortunately you were looking at a pre-release version of the documentation - The 7.x in the URL signifies this is the documentation for the next minor version of Kibana 7. It will be part of the next version 7.10 which isn't released yet: https://github.com/elastic/kibana/pull/74848
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