How to rebuild Full Text indexes after MSSQL upgrade from 2014 to 2017

When I updated from 2014 to 2017 I chose the option to migrate Full-Text Indexes instead of rebuild them during the update. The update went well, and I’d like to repopulate those indexes now, but I’m not clear about how to initiate that. I rebuilt the catalog but that went super fast. Do I need to open properties of the Full-Text index of each table where it’s enabled and tell each to repopulate?