Currently, when mongos receives a findAndModify command, it occasionally attempts to update the shardKey on the collection. When it attempts to update the findAndModify command, it splits the command into a delete and an insert. However, the encryptionInformation struct is not propagated to the new delete and insert command. We should find a way to pass the relevant information from the encryptionInformation struct into the findAndModify command.

This will also affect update.