The storage layer behind SearchIndex.load/fetch should be safe for streaming ingestion and consistent…

The storage layer behind SearchIndex.load/fetch should be safe for streaming ingestion and consistent…: a task in MiMo-V2.6-RL-harbor-code: MiMo-V2.6-RL Code (Harbor) (Harbor dataset). Bulk writes must keep the existing id field/key construction and backend persistence behavior, honor a positive…