By default, result clustering is disabled; enabling it regroups the most relevant search results by similarities to allow quick identification of pertinent documents on the same subject.
Note: Result clustering is used transparently in the Search page (Content > Search) and in the Search Interface (i.e. groups of results are not identified).
To enable result clustering:
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Access the Result Clustering page (Index > Result Clustering).
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Select Result clustering enabled.
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Click

See also: What Is Result Clustering?, How to Customize Result Clustering