Is there a way to aggregate arrays from several objects in documents from the same source

I have a pipeline with a oracle insert snap and a error pipeline. Everything works. When something in the pipeline fails I am passing variables to the error pipeline and storing in a table. I want to pass the current JSON document that failed? What variable do I use to get the current JSON document that failed without having to concatenate all the values into a string myself? I want to pass the json document that failed to insert actually? I know its $.something but what?