$out takes documents returned by the aggregation pipeline and writes them to a specified collection. The $out operator must be the last stage in the aggregation pipeline. In Atlas Data Federation, you can use $out to write data from any one of the supported federated database instance stores or multiple supported federated database instance stores when using federated queries to any one of the following:
S3 buckets with read and write permissions
Atlas cluster namespace
Flag to run aggregation operations in the background. If
omitted, defaults to
Use this option if you want to submit other new queries without waiting for currently running queries to complete or disconnect your federated database instance connection while the queries continue to run in the background.
Run Query in the background