Coveo for Sitecore integrates high availability into its infrastructure to improve indexing and decrease query response time. It also ensures that the system is always ready to index items and answer queries with the best latency. Therefore, a user facing a Coveo-powered search page will get a better search experience.
In a cloud environment, high availability isn’t configured by hand. No changes are required in Coveo for Sitecore. Coveo achieves high availability by handling all underlying systems required to achieve querying freshness and effective indexing.