Search on Pages Sites
It’s easy to add search functionality to a site.
We recommend using Search.gov, a free site search and search analytics service for federal web sites. You will need to register for Search.gov and follow their instructions to integrate this service with your Pages site. For full details, visit Search.gov.
If you’d prefer another solution, you can configure a tool like lunrjs that creates a search function run using the client browser. An example of this is at the 18F blog. This avoids any dependency on another service, but the search results are not as robust.