@Document(collection = "zones")
public class Zone implements Identifiable<String> {
... (other fields)
private GeoJsonPoint location;
... (getters/setters)
}

@Repository
public interface ZoneRepository extends CrudRepository<Zone, String> {

    List<Zone> findByLocationNear(Point p, Distance d);

}

...
Point p = new GeoJsonPoint(Double.valueOf(longitude), Double.valueOf(latitude));
Distance d = new Distance(distance, Metrics.KILOMETERS);
return zoneRepository.findByLocationNear(p, d);

db.zones.find( { "location" :
                 { $near :
                   { $geometry : { type : "Point" , coordinates : [-82.706480, 28.038458]},
                     $maxDistance : 50
 } } } )

{
    "_id" : ObjectId("12341983471693746"),
    "name" : "Some location",
    "location" : {
        "type" : "Point",
        "coordinates" : [
            -82.706480,
            28.038458
        ]
    },
}