code: public BaseWindowedBolt<T> ingestionTimeWindow(Time size) {
          long s = size.toMilliseconds();
          ensurePositiveTime(s);
  
          setSizeAndSlide(s, DEFAULT_SLIDE);
          this.windowAssigner = TumblingIngestionTimeWindows.of(s);
          return this;
      }
docs: define a tumbling ingestion time window
  
  @param size window size