@Override
    public void close() {
        for (Iterator<T> iterator : this.iterators) {
            CloseableIterator.closeIterator(iterator);
        }
    }
Close the underlying iterators if auto-closeable. Note that when Exception is thrown from any iterator
in the for loop on closing, remaining iterators possibly left unclosed.
gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/util/iterator/AbortiveMultiIterator.java