def MOD(x, y):
return {'<STR_LIT>': [x, y]}<EOL>
Divides one number by another and returns the remainder.
See https://docs.mongodb.com/manual/reference/operator/aggregation/mod/
for more details
:param x: The number or field is the dividend,
:param y: The number or field is the divisor,
:return: Aggregation operator