static Opener create(org.apache.hadoop.fs.FileSystem fileSystem,
                             org.apache.hadoop.fs.Path path,
                             long size,
                             int blockCount) throws IOException {
            return b -> {
                return DFSByteBufferReader.open(fileSystem, path, size, blockCount, b);
            };
        }
Wrap a ByteBufferReader into an {@link Opener}.
Note that the close will <b>not</b> passed to the opener,
indexr-common/src/main/java/io/indexr/io/ByteBufferReader.java