public static EventStrategy forceGetEventStrategy(final Traversal.Admin<Object, Object> traversal){
        return traversal.getStrategies().getStrategy(EventStrategy.class).get();
    }
Register a vertex property addition event with the callback registry.
gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/step/util/event/EventUtil.java