Marks a key as enabled, thereby permitting its use.
/// The system timed out while trying to fulfill the request. The request can be retried.
///
/// The request was rejected because a specified ARN was not valid.
///
/// The request was rejected because an internal exception occurred. The request can be
/// retried.
///
/// The request was rejected because the state of the specified resource is not valid
/// for this request.
///
///
///
/// For more information about how key state affects the use of a CMK, see How
/// Key State Affects Use of a Customer Master Key in the AWS Key Management Service
/// Developer Guide.
///
///
/// The request was rejected because a limit was exceeded. For more information, see
Limits
/// in the
AWS Key Management Service Developer Guide.
///
/// The request was rejected because the specified entity or resource could not be found.
///
