resource/alicloud_instance: remove default value for system_disk_cate…

…gory.

alicloud/resource_alicloud_instance.go

@@ -653,7 +653,6 @@ func resourceAliCloudInstanceCreate(d *schema.ResourceData, meta interface{}) er
 		request["SystemDisk.PerformanceLevel"] = v
 	}
 
-	request["SystemDisk.Category"] = "cloud_efficiency"
 	if v, ok := d.GetOk("system_disk_category"); ok {
 		request["SystemDisk.Category"] = v
 	}

website/docs/r/instance.html.markdown

@@ -96,7 +96,7 @@ The following arguments are supported:
 * `instance_name` - (Optional) The name of the ECS. This instance_name can have a string of 2 to 128 characters, must contain only alphanumeric characters or hyphens, such as "-",".","_", and must not begin with a hyphen, and must not begin with http:// or https://. If not specified, 
 Terraform will autogenerate a default name is `ECS-Instance`.
 * `allocate_public_ip` - (Deprecated) It has been deprecated from version "1.7.0". Setting "internet_max_bandwidth_out" larger than 0 can allocate a public ip address for an instance.
-* `system_disk_category` - (Optional, ForceNew) Valid values are `ephemeral_ssd`, `cloud_efficiency`, `cloud_ssd`, `cloud_essd`, `cloud`, `cloud_auto`, `cloud_essd_entry`. only is used to some none I/O optimized instance. Default to `cloud_efficiency`. Valid values `cloud_auto` Available since 1.184.0+.
+* `system_disk_category` - (Optional, ForceNew) Valid values are `ephemeral_ssd`, `cloud_efficiency`, `cloud_ssd`, `cloud_essd`, `cloud`, `cloud_auto`, `cloud_essd_entry`. only is used to some none I/O optimized instance. Valid values `cloud_auto` Available since 1.184.0+.
 * `system_disk_name` - (Optional, Available since 1.101.0) The name of the system disk. The name must be 2 to 128 characters in length and can contain letters, digits, periods (.), colons (:), underscores (_), and hyphens (-). It must start with a letter and cannot start with http:// or https://.
 * `system_disk_description` - (Optional, Available since 1.101.0) The description of the system disk. The description must be 2 to 256 characters in length and cannot start with http:// or https://.
 * `system_disk_size` - (Optional) Size of the system disk, measured in GiB. Value range: [20, 500]. The specified value must be equal to or greater than max{20, Imagesize}. Default value: max{40, ImageSize}.