GeoPoint

Generally, you would insert the data as follows:

PUT GeoLoc/doc/1
{ 
  "location": {
    "lat": 41.12,
    "lon": -71.34
  }
}

This is further described in the Geopoint documentation.

Now, it depends how you are ingesting data into Elasticsearch. Are you using Beats, Logstash, or some other homebrewn solution?