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This hook is called when the user signals the desire to start a search.
You can use this function as a simple way to launch the search UI, in response to a menu item, search button, or other widgets within your activity. Unless overidden, calling this function is the same as calling Activity.StartSearch(string, System.Boolean, System.Boolean, System.Boolean), which launches search for the current activity as specified in its manifest, see Android.App.SearchManager.
You can override this function to force global search, e.g. in response to a dedicated search key, or to block search entirely (by simply returning false).
Note: when running in a Android.Content.Res.Configuration.UiModeTypeTelevision, the default implementation changes to simply return false and you must supply your own custom implementation if you want to support search.