Delivering 504 parcels one by one means 504 round trips of the truck: the road (the HTTP connection) costs more than the parcel. _bulk is loading the truck: a single request that carries hundreds of operations, each written on two lines, the label ("index into cours with id C0001") then the parcel (the document). The driver comes back with a delivery note, items, that says parcel by parcel what happened, and a global warning light, errors, that turns on as soon as a single parcel was refused. This is exactly what labo.sh importer does with the three .ndjson files of the kit; and _reindex is the same truck loading directly from one index to unload into another.
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