When you look in Kibana Management > Index Patterns and select your index pattern you need to see the type as geo_point as shown below. But based on the mapping you got back from Elasticsearch for your index I'm thinking you're not going to see that.
This is really a logstash/elasticsearch issue to get logstash mapping correct vs a Kibana issue so I'm probably not the best person to help you solve this issue. Here's some other related issues I found in the Kibana forum, but if these don't help you I recommend you search for geo_point in the logstash discuss channel.
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