Currently, a dump from an older version of MongoDB via mongodump is not supported when restoring to a recent MongoDB via mongorestore.

One of the ways that many database vendors support database upgrades is by being able to backup a database from one version and restore it to the latest version.  Currently, MongoDB tools like Mongodump and Mongorestore are not supported --.g. you can only restore to the same version of MongoDB where you issued the Mongodump.  While this is MongoDB’s official position, word on the street from TSEs and customers is that the practice of using Mongorestore to restore to a later version of MongoDB is common practice.  To provide the best database experience and align with user expectations, Mongorestore should be supported when restoring a dump file created by any currently supported version of MongoDB.