for 7.2.4-version
/usr/share/zabbix/ui/app/controllers
CControllerSearch7.php

/usr/share/zabbix/ui/include
defines.inc7.php

/usr/share/zabbix/ui/app/views
search7.php

Important!
You must first backup the original version files:
CControllerSearch.php
defines.inc.php
search.php

Then copy the following files into their respective directories
CControllerSearch7.php --> CControllerSearch.php
defines.inc7.php --> defines.inc.php
search7.php --> search.php