PYTHON-4925 Stop sending upsert:False

Author: ShaneHarvey

pymongo/operations.py

@@ -332,7 +332,7 @@ def __init__(
         self,
         filter: Mapping[str, Any],
         replacement: Union[_DocumentType, RawBSONDocument],
-        upsert: bool = False,
+        upsert: Optional[bool] = None,
         collation: Optional[_CollationIn] = None,
         hint: Optional[_IndexKeyHint] = None,
         namespace: Optional[str] = None,
@@ -693,7 +693,7 @@ def _add_to_bulk(self, bulkobj: _AgnosticBulk) -> None:
             self._filter,
             self._doc,
             True,
-            bool(self._upsert),
+            self._upsert,
             collation=validate_collation_or_none(self._collation),
             array_filters=self._array_filters,
             hint=self._hint,