docs: @BetaApi
    public final Operation setTargetPoolsRegionInstanceGroupManager(
        ProjectRegionInstanceGroupManagerName instanceGroupManager,
        RegionInstanceGroupManagersSetTargetPoolsRequest
            regionInstanceGroupManagersSetTargetPoolsRequestResource) {
  
      SetTargetPoolsRegionInstanceGroupManagerHttpRequest request =
          SetTargetPoolsRegionInstanceGroupManagerHttpRequest.newBuilder()
              .setInstanceGroupManager(
                  instanceGroupManager == null ? null : instanceGroupManager.toString())
              .setRegionInstanceGroupManagersSetTargetPoolsRequestResource(
                  regionInstanceGroupManagersSetTargetPoolsRequestResource)
              .build();
      return setTargetPoolsRegionInstanceGroupManager(request);
    }