| gt | Finds results where the field is greater than the specified value. |
| gte | Finds results where the field is greater than or equal to the specified value. |
| lt | Finds results where the field is less than the specified value. |
| lte | Finds results where the field is less than or equal to the specified value. |
| ne | Finds results where the field is not equal to the specified value. |
| in | Finds results where the field is equal to any value in the specified array. |
| nin | Finds results where the field is not equal to any value in the specified array. |
| exists | Finds documents where the field is not null. |