Grafana Worldmap panel : country / city name labels


I display data in grafana based on elasticsearch. I would like to display the data on world map panel along with a description of the city or country. The location on the map is displayed but when strange names appear in the description field instead of the names of the place. In the visualizations, when I enter the field name responsible for displaying the name of the place, the markers on the map disappear. Markers are displayed only when in the location name field I have the same value as in geo_point (geoip.coordinates) or when I leave the field empty.

Has anyone encountered anything similar issue?