Worldmap doesn't show points

The worldmap doesn’t show any points , i don’t kown why, someone can help me ?
elasticsearch 6.4
Grafana v5.2.4

Query inspectory return datas

I notice that the hash key of geoip.location include three characters (picture 2), i looked another grafana hash key of geoip.location include eight characters, is the reason for why my worldmap can’t show points.

Map data Options

resolved

Location Name Field: geoip.city_name.keyword