'Configures the availability options for a domain. Enabling the
Multi-AZ option expands an Amazon CloudSearch domain to an
additional Availability Zone in the same Region to increase
fault tolerance in the event of a service disruption. Changes
to the Multi-AZ option can take about half an hour to become
active. For more information, see `Configuring Availability
Options`_ in the Amazon CloudSearch Developer Guide .
:type domain_name: string
:param domain_name: A string that represents the name of a domain.
Domain names are unique across the domains owned by an account
within an AWS region. Domain names start with a letter or number
and can contain the following characters: a-z (lowercase), 0-9, and
- (hyphen).
:type multi_az: boolean
:param multi_az: You expand an existing search domain to a second
Availability Zone by setting the Multi-AZ option to true.
Similarly, you can turn off the Multi-AZ option to downgrade the
domain to a single Availability Zone by setting the Multi-AZ option
to `False`.'

def update_availability_options(self, domain_name, multi_az):

    params = {'DomainName': domain_name, 'MultiAZ': multi_az}
    return self._make_request(action='UpdateAvailabilityOptions', verb='POST', path='/', params=params)
