egalpin commented on PR #21895:
URL: https://github.com/apache/beam/pull/21895#issuecomment-1156758658

   Agreed @steveniemitz , I originally misunderstood 
`setWindowingStrategyInternal` to be exactly what you described.  The slightly 
longer form version that I believe works is:
   
   ```java
   WindowingStrategy<Document, ?> originalStrategy =
         (WindowingStrategy<Document, ?>) input.getWindowingStrategy();
    
   ...     
    
   input.apply(
       Window
           .into(originalStrategy.getWindowFn())
           .triggering(originalStrategy.getTrigger())
           .withAllowedLateness(originalStrategy.getAllowedLateness()))
   
   ```


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