What are Cluster Results?
Google cluster results in group search results.
In 2008 Google patent was granted for Cluster Results. The new tech provided a more different search results. Before a domain was not limited. And could top rank multiple pages.
Cluster Results group similar pages from the same domain as one group result.
The new Cluster Results will impact your site by reducing single page exposure. Cluster analysis will group site content. SEO ranking for your site will overall improve if you have quality content and traffic to show interaction and usefulness. While sites that publish vast amounts of data online, to gain multiple page ranks, can expect less traffic.