Create geo_point from nested coordinates

Elastic Stack Logstash
8

this is my first time trying to do my own mapping in an index and i cannot seem to get the mapping to take. This is what i'm trying to do with no success.

PUT _template/logstash/
{
  "mappings": {
      "properties": {
          "vehicle:" {
          "location": {
            "type": "geo_point"
          }
        }
      }
    }
  }