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 <a href="http://docs.aws.amazon.com/cloudsearch/latest/developerguide/configuring-availability-options.html" target="_blank">Configuring Availability Options</a> in the <i>Amazon CloudSearch Developer Guide</i>.