code: @BetaApi
    public final Operation insertRegionBackendService(
        String region, BackendService backendServiceResource) {
  
      InsertRegionBackendServiceHttpRequest request =
          InsertRegionBackendServiceHttpRequest.newBuilder()
              .setRegion(region)
              .setBackendServiceResource(backendServiceResource)
              .build();
      return insertRegionBackendService(request);
    }
docs: Creates a regional BackendService resource in the specified project using the data included in
  the request. There are several restrictions and guidelines to keep in mind when creating a
  regional backend service. Read Restrictions and Guidelines for more information.
  
  <p>Sample code:
  
  <pre><code>
  try (RegionBackendServiceClient regionBackendServiceClient = RegionBackendServiceClient.create()) {
  ProjectRegionName region = ProjectRegionName.of("[PROJECT]", "[REGION]");
  BackendService backendServiceResource = BackendService.newBuilder().build();
  Operation response = regionBackendServiceClient.insertRegionBackendService(region.toString(), backendServiceResource);
  }
  </code></pre>
  
  @param region Name of the region scoping this request.
  @param backendServiceResource A BackendService resource. This resource defines a group of
  backend virtual machines and their serving capacity. (== resource_for v1.backendService ==)
  (== resource_for beta.backendService ==)
  @throws com.google.api.gax.rpc.ApiException if the remote call fails