All PackedInts APIs should share a common interface for random-access reads

        final BlockPackedReader reader = new BlockPackedReader(data, entry.packedIntsVersion, entry.blockSize, entry.count, true);
        return new LongNumericDocValues() {
          @Override
          public long get(long id) {
            return reader.get(id);
          }
        };

        return new BlockPackedReader(data, entry.packedIntsVersion, entry.blockSize, entry.count, true);