code: public BaseWindowedBolt withWatermarkInterval(Duration interval) {
          windowConfiguration.put(Config.TOPOLOGY_BOLTS_WATERMARK_EVENT_INTERVAL_MS, interval.value);
          return this;
      }
docs: Specify the watermark event generation interval. For tuple based timestamps, watermark events
  are used to track the progress of time
  
  @param interval the interval at which watermark events are generated