code: @BetaApi
    public final Operation deleteRegionBackendService(String backendService) {
  
      DeleteRegionBackendServiceHttpRequest request =
          DeleteRegionBackendServiceHttpRequest.newBuilder()
              .setBackendService(backendService)
              .build();
      return deleteRegionBackendService(request);
    }
docs: Deletes the specified regional BackendService resource.
  
  <p>Sample code:
  
  <pre><code>
  try (RegionBackendServiceClient regionBackendServiceClient = RegionBackendServiceClient.create()) {
  ProjectRegionBackendServiceName backendService = ProjectRegionBackendServiceName.of("[PROJECT]", "[REGION]", "[BACKEND_SERVICE]");
  Operation response = regionBackendServiceClient.deleteRegionBackendService(backendService.toString());
  }
  </code></pre>
  
  @param backendService Name of the BackendService resource to delete.
  @throws com.google.api.gax.rpc.ApiException if the remote call fails