docs: public static void saveSequenceFileSequences(String path, JavaRDD<List<List<Writable>>> rdd,
                       Integer maxOutputFiles) {
          path = FilenameUtils.normalize(path, true);
          if (maxOutputFiles != null) {
              rdd = rdd.coalesce(maxOutputFiles);
          }
          JavaPairRDD<List<List<Writable>>, Long> dataIndexPairs = rdd.zipWithUniqueId(); //Note: Long values are unique + NOT contiguous; more efficient than zipWithIndex
          JavaPairRDD<LongWritable, SequenceRecordWritable> keyedByIndex =
                          dataIndexPairs.mapToPair(new SequenceRecordSavePrepPairFunction());
  
          keyedByIndex.saveAsNewAPIHadoopFile(path, LongWritable.class, SequenceRecordWritable.class,
                          SequenceFileOutputFormat.class);
      }