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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 com.google.cloud.dataflow.sdk.transforms.GroupByKey.applicableTo(GroupByKey.java:192)	at com.google.cloud.dataflow.sdk.transforms.View$AsIterable.validate(View.java:275)	at com.google.cloud.dataflow.sdk.transforms.View$AsIterable.validate(View.java:268)	at com.google.cloud.dataflow.sdk.Pipeline.applyInternal(Pipeline.java:366)	at com.google.cloud.dataflow.sdk.Pipeline.applyTransform(Pipeline.java:274)	at com.google.cloud.dataflow.sdk.values.PCollection.apply(PCollection.java:161)	at com.google.cloud.dataflow.sdk.io.Write$Bound.createWrite(Write.java:214)	at com.google.cloud.dataflow.sdk.io.Write$Bound.apply(Write.java:79)	at com.google.cloud.dataflow.sdk.io.Write$Bound.apply(Write.java:68)	at com.google.cloud.dataflow.sdk.runners.PipelineRunner.apply(PipelineRunner.java:74)	at com.google.cloud.dataflow.sdk.runners.DirectPipelineRunner.apply(DirectPipelineRunner.java:247)	at com.google.cloud.dataflow.sdk.Pipeline.applyInternal(Pipeline.java:367)	at com.google.cloud.dataflow.sdk.Pipeline.applyTransform(Pipeline.java:290)	at com.google.cloud.dataflow.sdk.values.PCollection.apply(PCollection.java:174)	at com.google.cloud.dataflow.sdk.io.BigQueryIO$Write$Bound.apply(BigQueryIO.java:1738)	at com.google.cloud.dataflow.sdk.io.BigQueryIO$Write$Bound.apply(BigQueryIO.java:1440)	at com.google.cloud.dataflow.sdk.runners.PipelineRunner.apply(PipelineRunner.java:74)	at com.google.cloud.dataflow.sdk.runners.DirectPipelineRunner.apply(DirectPipelineRunner.java:247)	at com.google.cloud.dataflow.sdk.Pipeline.applyInternal(Pipeline.java:367)	at com.google.cloud.dataflow.sdk.Pipeline.applyTransform(Pipeline.java:274)	at com.google.cloud.dataflow.sdk.values.PCollection.apply(PCollection.java:161)	at co.uk.bubblestudent.dataflow.StarterPipeline.main(StarterPipeline.java:116)