code: public static Bson geoWithin(final String fieldName, final Geometry geometry) {
          return new GeometryOperatorFilter<Geometry>("$geoWithin", fieldName, geometry);
      }
docs: Creates a filter that matches all documents containing a field with geospatial data that exists entirely within the specified shape.
  
  @param fieldName the field name
  @param geometry  the bounding GeoJSON geometry object
  @return the filter
  @since 3.1
  @mongodb.driver.manual reference/operator/query/geoWithin/ $geoWithin
  @mongodb.server.release 2.4