Mongos does not support db.cloneCollection().
1st Method
db.cloneCollection(from, collection, query);
db.cloneCollection(‘’, ‘profiles’,{ ‘active’ : true } )
2nd Method depricated since 3.0 version
db.collection.copyTo(“new collection name”); # But its depricated in 3.4 but it works.
3st Method With Mongodump
mongodump –db db-name –collection collection-name –archive=collection-name.archive
For more detail about Clone Collection: Click Here

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