public static FieldUpdate createDivide(Field field, Number divisor) {
        return new FieldUpdate(field, ValueUpdate.createDivide(divisor));
    }
Creates a new field update, with one encapsulated value update that divides a value.
Note that the data type must be a numeric type.

@param field     the field to divide the value of
@param divisor the number to divide by
@return a FieldUpdate specifying the division
@throws UnsupportedOperationException if the data type is non-numeric
@see ValueUpdate#createDivide(Number)
document/src/main/java/com/yahoo/document/update/FieldUpdate.java