@Override
  public void encode(BlockIndexChunk blockIndexChunk, boolean rootIndexBlock, DataOutput out)
    throws IOException {
    if (rootIndexBlock) {
      writeRoot(blockIndexChunk, out);
    } else {
      writeNonRoot(blockIndexChunk, out);
    }
  }
Cannot be instantiated. Use {@link #INSTANCE} instead.
hbase-server/src/main/java/org/apache/hadoop/hbase/io/hfile/NoOpIndexBlockEncoder.java