anchor.diff:  							Default:      "NEVER",
   							Optional:     true,
   							ValidateFunc: validation.StringInSlice([]string{"NEVER", "ON_PERMANENT_INSTANCE_DELETION"}, true),
  +							Description:  `A value that prescribes what should happen to the stateful disk when the VM instance is deleted. The available options are NEVER and ON_PERMANENT_INSTANCE_DELETION. NEVER detatch the disk when the VM is deleted, but not delete the disk. ON_PERMANENT_INSTANCE_DELETION will delete the stateful disk when the VM is permanently deleted from the instance group. The default is NEVER.`,
   						},
   					},
   				},
  
positive.code: 							Optional:      true,
  							ConflictsWith: []string{"update_policy.0.max_surge_fixed"},
  							ValidateFunc:  validation.IntBetween(0, 100),
  						},
  
  						"max_unavailable_fixed": {
  
negative.code: 							Optional:      true,
  							ConflictsWith: []string{"update_policy.0.max_unavailable_fixed"},
  							ValidateFunc:  validation.IntBetween(0, 100),
  							Description:   `The maximum number of instances(calculated as percentage) that can be unavailable during the update process. Conflicts with max_unavailable_fixed.`,
  						},
  
  						"min_ready_sec": {
  							Type:         schema.TypeInt,
  							Optional:     true,
  							ValidateFunc: validation.IntBetween(0, 3600),
  							Description:  `Minimum number of seconds to wait for after a newly created instance becomes available. This value must be from range [0, 3600].`,
  						},
  					},
  				},
  			},
  
  			"wait_for_instances": {
  				Type:        schema.TypeBool,
  				Optional:    true,
  				Default:     false,
  				Description: `Whether to wait for all instances to be created/updated before returning. Note that if this is set to true and the operation does not succeed, Terraform will continue trying until it times out.`,
  			},
  <% unless version == 'ga' -%>
  			"stateful_disk": {
  				Type:        schema.TypeSet,
  				Optional:    true,
  				Description: `Disks created on the instances that will be preserved on instance delete, update, etc.`,
  				Elem: &schema.Resource{
  					Schema: map[string]*schema.Schema{
  						"device_name": {
  							Type:        schema.TypeString,
  							Required:    true,
  							Description: `The device name of the disk to be attached.`,
  						},
  
  						"delete_rule": {
  