MongoDB 5.0 has been released with a bunch of new features. An important one is the capability to completely redefine the shard key of a collection in a sharded cluster. Resharding was a feature frequently requested by the customers. In MongoDB 4.4 only the refining of the shard was available; from now on you can [&]

https://www.percona.com/blog/resharding-in-mongodb-5-0/