'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: The identity of the application. This is
typically the full name of the application without the \'fabric:\' URI
scheme.
:type application_id: str
:param application_upgrade_description: Describes the parameters for
an application upgrade.
:type application_upgrade_description:
:class:`ApplicationUpgradeDescription
<azure.servicefabric.models.ApplicationUpgradeDescription>`
:param timeout: The server timeout for performing the operation in
seconds. This 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.
:type timeout: long
:param dict custom_headers: headers that will be added to the request
:param bool raw: returns the direct response alongside the
deserialized response
:param operation_config: :ref:`Operation configuration
overrides<msrest:optionsforoperations>`.
:rtype: None
:rtype: :class:`ClientRawResponse<msrest.pipeline.ClientRawResponse>`
if raw=true
:raises:
:class:`FabricErrorException<azure.servicefabric.models.FabricErrorException>`'

def start_application_upgrade(self, application_id, application_upgrade_description, timeout=60, custom_headers=None, raw=False, **operation_config):

    api_version = '3.0'
    url = '/Applications/{applicationId}/$/Upgrade'
    path_format_arguments = {'applicationId': self._serialize.url('application_id', application_id, 'str', skip_quote=True)}
    url = self._client.format_url(url, **path_format_arguments)
    query_parameters = {}
    query_parameters['api-version'] = self._serialize.query('api_version', api_version, 'str')
    if (timeout is not None):
        query_parameters['timeout'] = self._serialize.query('timeout', timeout, 'long', maximum=4294967295, minimum=1)
    header_parameters = {}
    header_parameters['Content-Type'] = 'application/json;    charset=utf-8'
    if custom_headers:
        header_parameters.update(custom_headers)
    body_content = self._serialize.body(application_upgrade_description, 'ApplicationUpgradeDescription')
    request = self._client.post(url, query_parameters)
    response = self._client.send(request, header_parameters, body_content, **operation_config)
    if (response.status_code not in [200]):
        raise models.FabricErrorException(self._deserialize, response)
    if raw:
        client_raw_response = ClientRawResponse(None, response)
        return client_raw_response
