Look up and return vectors, by ID, from a single namespace. The returned vectors include the vector data and/or metadata.
For on-demand indexes, since vector values are retrieved from object storage, fetch operations may have increased latency. If you only need metadata or IDs, consider using the query operation with includeValues set to false instead.
For guidance and examples, see Fetch data.
The vector IDs to fetch. Does not accept values containing spaces.