The Search Results macro allows you to display the results of a keyword search on a page. We are making some great changes to Search over the next few releases, and have observed that this macro is rarely used.
We ended support for the Search Results macro in Confluence 7.0, and hid it from the macro browser. Any existing instances of this macro will still work, but you won't be able to insert this macro into the editor using the macro browser.
End of support means Atlassian will not fix bugs related to this macro in Confluence 7.0 or later versions.
To check whether a macro is used in your site, go to General Configuration > Macro Usage.