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java.lang.IllegalStateException: Unable to create a side-input view from input at$AsIterable.validate( at$AsIterable.validate( at at at at$Bound.createWrite( at$Bound.apply( at$Bound.apply( at at at at at at$Write$Bound.apply( at$Write$Bound.apply( at at at at at at by: java.lang.IllegalStateException: GroupByKey cannot be applied to non-bounded PCollection in the GlobalWindow without a trigger. Use a Window.into or Window.triggering transform prior to GroupByKey. at at$AsIterable.validate( ... 20 more