Remove encrypted message search feature flag

See matrix-org/matrix-react-sdk#4467

docs/labs.md

@@ -75,14 +75,6 @@ instead of verifying each of their devices.
 
 This feature is still in development and will be landing in several chunks.
 
-## Event indexing and E2EE search support using Seshat (`feature_event_indexing`)
-
-Adds support for search in E2E encrypted rooms. This enables an event indexer
-that downloads, stores, and indexes room messages for E2E encrypted rooms.
-
-The existing search will transparently work for encrypted rooms just like it
-does for non-encrypted.
-
 ## Bridge info tab (`feature_bridge_state`)
 
 Adds a "Bridge Info" tab to the Room Settings dialog, if a compatible bridge is

riot.im/develop/config.json

@@ -22,7 +22,6 @@
         "feature_dm_verification": "labs",
         "feature_cross_signing": "enable",
         "feature_invite_only_padlocks": "enable",
-        "feature_event_indexing": "disable",
         "feature_bridge_state": "labs",
         "feature_presence_in_room_list": "labs",
         "feature_custom_themes": "labs"