How does search functionality work in Universal Editor for Edge Delivery Service (EDS)?

Hi,

there are different options for search, for simple cases you could rely on indexing and the ffetch library. This allows to filter down the index entries based on the user search. Be aware that indexing works on the undecorated html when building your selector for inclusion into the index.
A pretty complete multi-lingual example for an indexing configuration including specialized indexes can be found in the experience league modernization repository here 

If your search requirements are more complex you should probably rely on a third party search solution instead