fixup: Fix failing mongodb indexes on startup

Signed-off-by: Denys Fedoryshchenko <denys.f@collabora.com>

Author: nuclearcat

api/pubsub_mongo.py

@@ -193,13 +193,11 @@ async def _ensure_indexes(self):
         # Migration handles dropping the old index first.
         await event_col.create_index(
             'timestamp',
-            expireAfterSeconds=604800,
-            name='ttl_timestamp'
+            expireAfterSeconds=604800
         )
         # Compound index for efficient pub/sub catch-up queries
         await event_col.create_index(
-            [('channel', ASCENDING), ('sequence_id', ASCENDING)],
-            name='channel_sequence_id'
+            [('channel', ASCENDING), ('sequence_id', ASCENDING)]
         )
         # Compound index for filtered event queries (kind + timestamp)
         await event_col.create_index(