@Override
    protected void sideEffect(final Traverser.Admin<S> traverser) {
        throw new FailException(traversal, traverser, message, metadata);
    }
Triggers an immediate failure of the traversal by throwing a {@code RuntimeException}. The exception thrown must
implement the {@link Failure} interface.
gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/step/sideEffect/FailStep.java