@Override
        public void fireEvent(final Iterator<MutationListener> eventListeners) {
            while (eventListeners.hasNext()) {
                eventListeners.next().vertexPropertyRemoved(vertexProperty);
            }
        }
Represents an action where a {@link Property} is removed from a {@link Vertex}.
gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/step/util/event/Event.java