docs: public static JavaPairRDD<Object, VertexWritable> applyGraphFilter(final JavaPairRDD<Object, VertexWritable> graphRDD, final GraphFilter graphFilter) {
          return graphRDD.mapPartitionsToPair(partitionIterator -> {
              final GraphFilter gFilter = graphFilter.clone();
              return IteratorUtils.filter(partitionIterator, tuple -> (tuple._2().get().applyGraphFilter(gFilter)).isPresent());
          }, true);
      }