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The default complex search that is triggered by selecting a filed is based on the search query that was executed, grouping by the search results by the selected interesting filed.
To perform a complex search:
In the Augmented Search Pane, under Interesting Fields, choose a field to include in your complex search. On the bottom of the list, you can click Load more to choose from other interesting fields.
A menu of functions that can be performed on the field is displayed.From the menu, select the function to perform on the interesting field.
The search query is automatically updated, transforming the simple search to a complex search, and the search runs, displaying a result summary table.
Alternatively, you can type a complex search query into the Search Query Panel (see Complex Search Syntax Reference).