AWS Database Migration Service (AWS DMS) has expanded functionality by adding support for Amazon DocumentDB 4.0 as a source. Amazon DocumentDB (with MongoDB compatibility) is a fast, scalable, highly available, and fully managed document database service that supports MongoDB workloads. As a document database, Amazon DocumentDB makes it easy to store, query, and index JSON data. Using AWS DMS, you can now perform live migrations from Amazon DocumentDB 4.0 clusters to any AWS DMS supported targets with minimal downtime.
Source:: Amazon AWS