Type of the first two columns are date and type of the third column, "geom" is geo_point with valid POINT (lon lat) format according to the ES document.
Issue is, when I import this test.csv file into the Kibana, in Advanced tab, in the mapping section, Kibana recognizes the "geom" column as keyword.
Then I re-write/change the type to geo_point as shown below:
Just a guess, but have you tried putting the geo_point field in quotation marks?
I also see that there was an issue with the geo_point field that was fixed 7.3.1. See: https://github.com/elastic/kibana/issues/46675. However, from your comment it looks like you're on 7.5
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