code: public PythonWindowedStream count_window(long size, long slide) {
  		return new PythonWindowedStream<GlobalWindow>(this.stream.countWindow(size, slide));
  	}
docs: A thin wrapper layer over {@link KeyedStream#countWindow(long, long)}.
  
  @param size The size of the windows in number of elements.
  @param slide The slide interval in number of elements.
  @return The python windowed stream {@link PythonWindowedStream}