I need to create a sliding window of 4 events in Flink streaming application. 
The window should slide by one event per every new arriving event. Furthermore, 
per each new arriving event I need to calculate the aggregate sum of a 
particular field in the 4 events I have in the window. I have referred [1] 
which describes how this can be implemented based on time. But my use case if 
little different, hence I am wondering how the window can be slided when a new 
event gets added to the window.


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