docs: @BetaApi
    public final BackendBucket getBackendBucket(ProjectGlobalBackendBucketName backendBucket) {
  
      GetBackendBucketHttpRequest request =
          GetBackendBucketHttpRequest.newBuilder()
              .setBackendBucket(backendBucket == null ? null : backendBucket.toString())
              .build();
      return getBackendBucket(request);
    }