code: public void close() throws IOException {
  		System.out.println("Serialized "
  				+ this.jsonSerializer.getEntityDocumentCount()
  				+ " item documents to JSON file " + OUTPUT_FILE_NAME + ".");
  		this.jsonSerializer.close();
  	}
docs: Closes the output. Should be called after the JSON serialization was
  finished.
  
  @throws IOException
  if there was a problem closing the output