| $inc |
Increments the value of the field by the specified amount. |
| $mul |
Multiplies the value of the field by the specified amount. |
| $rename |
Renames a field. |
| $setOnInsert |
Sets the value of a field if an update results in an insert of a document. Has no effect on update operations that modify existing documents. |
| $set |
Sets the value of a field in a document. |
| $unset |
Removes the specified field from a document. |
| $min |
Only updates the field if the specified value is less than the existing field value. |
| $max |
Only updates the field if the specified value is greater than the existing field value. |
| $currentDate |
Sets the value of a field to current date, either as a Date or a Timestamp. |
