code: public BucketingSink<T> setFSConfig(org.apache.hadoop.conf.Configuration config) {
  		this.fsConfig = new Configuration();
  		for (Map.Entry<String, String> entry : config) {
  			fsConfig.setString(entry.getKey(), entry.getValue());
  		}
  		return this;
  	}
docs: Specify a custom {@code Configuration} that will be used when creating
  the {@link FileSystem} for writing.