code: @BetaApi
    public final AggregatedListBackendServicesPagedResponse aggregatedListBackendServices(
        String project) {
      AggregatedListBackendServicesHttpRequest request =
          AggregatedListBackendServicesHttpRequest.newBuilder().setProject(project).build();
      return aggregatedListBackendServices(request);
    }
docs: Retrieves the list of all BackendService resources, regional and global, available to the
  specified project.
  
  <p>Sample code:
  
  <pre><code>
  try (BackendServiceClient backendServiceClient = BackendServiceClient.create()) {
  ProjectName project = ProjectName.of("[PROJECT]");
  for (BackendServicesScopedList element : backendServiceClient.aggregatedListBackendServices(project.toString()).iterateAll()) {
  // doThingsWith(element);
  }
  }
  </code></pre>
  
  @param project Name of the project scoping this request.
  @throws com.google.api.gax.rpc.ApiException if the remote call fails