It is important to be wary of the size of the data inserted into your mongodb cluster as it may cause an error similar to error below. If this happens in mongodb atlas, this may cause a scale up activity to increase the disk space capacity to avoid service degredation. Your replica servers may experience restarts.
Error: create indexes for appdb.sample_events: (OutOfDiskSpace) Index build failed: <build-id>: Collection appdb.sample_events ( <collection-id> ) :: caused by :: available disk space of ~393 MB is less than required minimum of 500 MB