code: @BetaApi
    public final Operation insertInstanceGroup(String zone, InstanceGroup instanceGroupResource) {
  
      InsertInstanceGroupHttpRequest request =
          InsertInstanceGroupHttpRequest.newBuilder()
              .setZone(zone)
              .setInstanceGroupResource(instanceGroupResource)
              .build();
      return insertInstanceGroup(request);
    }
docs: Creates an instance group in the specified project using the parameters that are included in
  the request.
  
  <p>Sample code:
  
  <pre><code>
  try (InstanceGroupClient instanceGroupClient = InstanceGroupClient.create()) {
  ProjectZoneName zone = ProjectZoneName.of("[PROJECT]", "[ZONE]");
  InstanceGroup instanceGroupResource = InstanceGroup.newBuilder().build();
  Operation response = instanceGroupClient.insertInstanceGroup(zone.toString(), instanceGroupResource);
  }
  </code></pre>
  
  @param zone The name of the zone where you want to create the instance group.
  @param instanceGroupResource InstanceGroups (== resource_for beta.instanceGroups ==) (==
  resource_for v1.instanceGroups ==) (== resource_for beta.regionInstanceGroups ==) (==
  resource_for v1.regionInstanceGroups ==)
  @throws com.google.api.gax.rpc.ApiException if the remote call fails