code: @BetaApi
    public final Operation insertRegionDisk(ProjectRegionName region, Disk diskResource) {
  
      InsertRegionDiskHttpRequest request =
          InsertRegionDiskHttpRequest.newBuilder()
              .setRegion(region == null ? null : region.toString())
              .setDiskResource(diskResource)
              .build();
      return insertRegionDisk(request);
    }
docs: Creates a persistent regional disk in the specified project using the data included in the
  request.
  
  <p>Sample code:
  
  <pre><code>
  try (RegionDiskClient regionDiskClient = RegionDiskClient.create()) {
  ProjectRegionName region = ProjectRegionName.of("[PROJECT]", "[REGION]");
  Disk diskResource = Disk.newBuilder().build();
  Operation response = regionDiskClient.insertRegionDisk(region, diskResource);
  }
  </code></pre>
  
  @param region Name of the region for this request.
  @param diskResource A Disk resource. (== resource_for beta.disks ==) (== resource_for v1.disks
  ==)
  @throws com.google.api.gax.rpc.ApiException if the remote call fails