Remove $addFields from list of unsafe aggregation operations. #3
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I was surprised to see $addFields in the list, as it does not modify any data in the database, but instead acts as a $project+, projecting all current fields to the next stage, plus any additional fields you might want to add (like a calculated field). Thus it can do no harm to the database, it can only modify the next stage in the pipeline, just as a $project would do.