vsphere/resource_vsphere_compute_cluster_host_group.go
func flattenClusterHostGroup(d *schema.ResourceData, obj *types.ClusterHostGroup) error {
	var hostIDs []string
	for _, v := range obj.Host {
		hostIDs = append(hostIDs, v.Value)
	}

	return structure.SetBatch(d, map[string]interface{}{
		"host_system_ids": hostIDs,
	})
}
func flattenClusterHostGroup(d *schema.ResourceData, obj *types.ClusterHostGroup) error {
	var hostIDs []string
	for _, v := range obj.Host {
		hostIDs = append(hostIDs, v.Value)
	}

	return structure.SetBatch(d, map[string]interface{}{
		"host_system_ids": hostIDs,
	})
}
// flattenClusterHostGroup saves a ClusterHostGroup into the supplied ResourceData.