Override @c SchemaServiceClient Default Endpoint

 // This service supports specifying a regional or locational endpoint prefix // when creating the SchemaServiceConnection. // For example, to connect to "europe-central2-pubsub.googleapis.com": auto client = google::cloud::pubsub::SchemaServiceClient( google::cloud::pubsub::MakeSchemaServiceConnection("europe-central2")); // This configuration is common with Private Google Access: // https://cloud.google.com/vpc/docs/private-google-access auto options = google::cloud::Options{}.set<google::cloud::EndpointOption>( "private.googleapis.com"); auto vpc_client = google::cloud::pubsub::SchemaServiceClient( google::cloud::pubsub::MakeSchemaServiceConnection(options));