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Append to MongoDB document's array attribute

Attached is the document of the MongoDB document that I wish to append do from NiFi. What I want to do is is simple: the document has an array attribute named 'reports'. I wish to take the FlowFile from NiFi, and append it to that report. I have had some success doing this process through the 'RunMongoAggregation' processor, but did not like the fact this aggregation ran on a schedule rather than an event/trigger based system.