Do not bundle aggregations for APIs which shouldn't include them. (#11592)

And make bundling aggregations opt-in, instead of opt-out to avoid
having APIs to include extraneous data (and being much heavier than
necessary).

1 files changed, 4 insertions, 1 deletions

diff --git a/synapse/handlers/pagination.py b/synapse/handlers/pagination.py

index 4f42438053..7469cc55a2 100644
--- a/synapse/handlers/pagination.py
+++ b/synapse/handlers/pagination.py
@@ -542,7 +542,10 @@ class PaginationHandler:
         chunk = {
             "chunk": (
                 await self._event_serializer.serialize_events(
-                    events, time_now, as_client_event=as_client_event
+                    events,
+                    time_now,
+                    bundle_aggregations=True,
+                    as_client_event=as_client_event,
                 )
             ),
             "start": await from_token.to_string(self.store),