Rebuild and activate one complete occupancy generation from canonical items.
The workflow is resumable: if the requested generation is already building,
every type is safely reindexed again. Normal writers dual-write while this
runs, and activation occurs only after every requested type completes.
Rebuild and activate one complete occupancy generation from canonical items.
The workflow is resumable: if the requested generation is already building, every type is safely reindexed again. Normal writers dual-write while this runs, and activation occurs only after every requested type completes.