When you make EMPL_RCD field as a search field, it won't get displayed on the search page unless you enable "Multiple Jobs Allowed" option on the PeopleTools Options page.
This option is common (purpose) for both HCM and FIN, but for HCM this is always selected after 8.9 version and it should be selected by default even though there is no need for it. Same is not true for FIN, hence it is always unselected by default. So you need to enable this option and to see EMPL_RCD on the search page. This option is common for all FIN modules i.e. wherever EMPL_RCD is marked as search key, it'll be displayed once the option is selected.
You do not need to clear cache or reboot app/web servers. It is a dynamic setting and it should work without reboot or clearing cache. But if you still don't see EMPL_RCD field on the search page, try clicking the search page (content reference text on the breadcrumbs) three four times once you are on search page.