The Cluster section consists of a list of clusters. Each cluster is a button that represents a group of results. Clusters can be thought of as a list of the major themes or topics that exist in the results found during the search.
Clicking on a cluster marks the first result of the cluster. The relevance scores for every index word and result are re-calculated based on their similarity to the marked result. Words that actually appear in a marked result have red relevance bars instead of the normal blue bars.
Related Topics:
About Clusters