Modifies the cluster configuration of the specified Elasticsearch domain, setting as setting the instance type and the number of instances.
/// An error occurred while processing the request.
///
/// The request processing has failed because of an unknown error, exception or failure
/// (the failure is internal to the service) . Gives http status code of 500.
///
/// An exception for trying to create or access sub-resource that is either invalid or
/// not supported. Gives http status code of 409.
///
/// An exception for trying to create more than allowed resources or sub-resources. Gives
/// http status code of 409.
///
/// An exception for accessing or deleting a resource that does not exist. Gives http
/// status code of 400.
///
/// An exception for missing / invalid input fields. Gives http status code of 400.
///
