code: public static GeoDistanceSortFieldBuilder geoDistance(String mapper, double latitude, double longitude) {
          return new GeoDistanceSortFieldBuilder(mapper, latitude, longitude);
      }
docs: Returns a new {@link SimpleSortFieldBuilder} for the specified field.
  
  @param mapper the name of mapper to use to calculate distance
  @param latitude the latitude of the reference point
  @param longitude the longitude of the reference point
  @return a new geo distance sort field builder