Remove leave_alive from changestream

Author: NoahStapp

pymongo/asynchronous/change_stream.py

@@ -258,8 +258,6 @@ async def _run_aggregation_cmd(
 
     async def _create_cursor(self) -> AsyncCommandCursor:  # type: ignore[type-arg]
         async with self._client._tmp_session(self._session) as s:
-            if s:
-                s.leave_alive = True
             return await self._run_aggregation_cmd(session=s)
 
     async def _resume(self) -> None:

pymongo/synchronous/change_stream.py

@@ -256,8 +256,6 @@ def _run_aggregation_cmd(self, session: Optional[ClientSession]) -> CommandCurso
 
     def _create_cursor(self) -> CommandCursor:  # type: ignore[type-arg]
         with self._client._tmp_session(self._session) as s:
-            if s:
-                s.leave_alive = True
             return self._run_aggregation_cmd(session=s)
 
     def _resume(self) -> None: