The criteria that select the subspace used for query matching.
The list of project IDs to search within. To learn more about the distinction between project names/IDs/numbers, go to https://cloud.google.com/docs/overview/#projects.
Optional. The list of locations to search within. 1. If empty,
search will be performed in all locations; 2. If any of the
locations are NOT in the valid locations list, error will be
returned; 3. Otherwise, search only the given locations for
matching results. Typical usage is to leave this field empty.
When a location is unreachable as returned in the
SearchCatalogResponse.unreachable field, users can repeat
the search request with this parameter set to get additional
information on the error. Valid locations: * asia-east1 *
asia-east2 * asia-northeast1 * asia-northeast2 * asia-
northeast3 * asia-south1 * asia-southeast1 * australia-
southeast1 * eu * europe-north1 * europe-west1 * europe-
west2 * europe-west3 * europe-west4 * europe-west6 *
global * northamerica-northeast1 * southamerica-east1 * us
* us-central1 * us-east1 * us-east4 * us-west1 * us-west2