https://docs.cloud.google.com/python/docs/reference/discoveryengine/latest/google.cloud.discoveryengine_v1alpha.types.FieldConfig.RetrievableOption
Class RetrievableOption (0.19.0) | Python client libraries | Google Cloud Documentation
python clientgoogle cloudclasslibrariesdocumentation
https://docs.cloud.google.com/python/docs/reference/retail/latest/google.cloud.retail_v2.types.CatalogAttribute.RetrievableOption
Class RetrievableOption (2.10.0) | Python client libraries | Google Cloud Documentation
python clientgoogle cloudclass