def start_application_upgrade(application_id, application_upgrade_description, timeout:60, custom_headers:nil)
      response = start_application_upgrade_async(application_id, application_upgrade_description, timeout:timeout, custom_headers:custom_headers).value!
      nil
    end
def start_application_upgrade(application_id, application_upgrade_description, timeout:60, custom_headers:nil)
      response = start_application_upgrade_async(application_id, application_upgrade_description, timeout:timeout, custom_headers:custom_headers).value!
      nil
    end
Starts upgrading an application in the Service Fabric cluster.

 Validates the supplied application upgrade parameters and starts upgrading
 the application if the parameters are valid.

 @param application_id [String] The identity of the application. This is
 typically the full name of the application without the 'fabric:' URI scheme.
 Starting from version 6.0, hierarchical names are delimited with the "~"
 character.
 For example, if the application name is "fabric:/myapp/app1", the application
 identity would be "myapp~app1" in 6.0+ and "myapp/app1" in previous versions.
 @param application_upgrade_description [ApplicationUpgradeDescription]
 Parameters for an application upgrade.
 @param timeout [Integer] The server timeout for performing the operation in
 seconds. This timeout specifies the time duration that the client is willing
 to wait for the requested operation to complete. The default value for this
 parameter is 60 seconds.
 @param custom_headers [Hash{String => String}] A hash of custom headers that
 will be added to the HTTP request.