Lack of support for CFM, advanced SSI, and other server-side code within FDSE template files
By default, the FDSE template files can contain straight text and HTML. They can also contain "active code" in two ways:
FDSE templates may include simple SSI directives. Details can be found at Customizing HTML: Parsing Server-Side Includes (SSI).
Those are the only two ways to use active code in the FDSE layout. Advanced SSI commands, or Cold Fusion / CFM commands, or other server-side language commands cannot be used within FDSE templates.
Note that FDSE can index and search content using these languages. These languages just can't be used to generate the search layout.
"Lack of support for CFM, advanced SSI, and other server-side code within FDSE template files" https://www.xav.com/scripts/search/help/1166.html