One vector per text, in order: an answer of any other count fails the call, a search before it asks the store
anything and indexSource before it writes the batch. The caller wires its model, its budget and its deadline. A
search hands it the search's signal as options.signal, so a request in flight is cancelled with the search;
indexing, and a search with no signal, pass no options.
Optional options: { Optional signal?: AbortSignalOptional batchHow many passages one embed call and one upsert carry.
64
What the index is made of.