grammar
db.collectionspace.collection.splitAsync(<source group>, <target group>, <percent>, [options] )
db.collectionspace.collection.splitAsync(<source group>, <target group>, <condition>, [endcondition], [options] )
This operation has the same function as split() , but this operation is an asynchronous partition operation, and the task ID is returned immediately after the partition task is created.
Click on Jushan Database Documentation Center for more information