RT:
Now find solutions

 
The db. The customer. The find ({}). ForEach (
The function (x) {
Var age=x.a ge; 
Var longAge=NumberLong (age); 
X.a ge=longAge; 
The db. The customer. The save (x); 
} 
); 

The poor efficiency, foreach again is not possible to save the data quantity is too big, we have encountered similar problems, how to solve?