Hi @ehfdub
I followed the recents docs and successfully created an index with geopoint field in Kibana 7.15.1, that was later recognized during index pattern creation in Kibana:
And this how it looks on Discover
What stack version do you use? Can you give it a try manually without logstash? If it will work, then you need to change logstash configuration, you can check the issue example here
Regards, Dzmitry