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Numerical values that are stored as Int32 in mongosh would have been stored by default as Double in the mongo shell. The Int32() constructor can be used to explicitly specify 32-bit integers.
NumberInt. The mongo shell treats all numbers as floating-point values by default. The mongo shell provides the NumberInt() constructor to explicitly specify 32-bit integers.
The insert() Method To insert data into MongoDB collection, you need to use MongoDB's insert() or save() method.
db.data.update({'name': 'zero'}, {'$set': {'value': NumberInt(0)}})
You can also use NumberLong.
A slightly simpler syntax (in Robomongo at least) worked for me:
db.database.save({ Year : NumberInt(2015) });
If the value type is already double, then update the value with $set command can not change the value type double to int when using NumberInt() or NumberLong() function. So, to Change the value type, it must update the whole record.
var re = db.data.find({"name": "zero"})
re['value']=NumberInt(0)
db.data.update({"name": "zero"}, re)
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