code: public static void registerOgmExternalizers(GlobalConfiguration globalCfg) {
  		Map<Integer, AdvancedExternalizer<?>> externalizerMap = globalCfg.serialization().advancedExternalizers();
  		externalizerMap.putAll( ogmExternalizers );
  	}
docs: Registers all custom Externalizer implementations that Hibernate OGM needs into a running
  Infinispan CacheManager configuration.
  This is only safe to do when Caches from this CacheManager haven't been started yet,
  or the ones already started do not contain any data needing these.
  
  @see ExternalizerIds
  @param globalCfg the Serialization section of a GlobalConfiguration builder