I just created a new report using the faceted search capability of 19.2. It's great -- my users will love it. However, in my apps, I always provide the ability to export the report contents to Excel. My normal 'Go To' report type is an IR, and the APEXIR_XLSX_PKG available on GitHub is great for exporting those to Excel. The underlying 'Excel export' code for that is xlsx_builder_pkg (which is a slightly modified version of Anton Scheffer's AS_XLSX package). The query2sheet function of that package would easily allow me to export a Faceted Search report to Excel... if I can derive the query programmatically.
For Interactive Reports, the APEX_IR.GET_REPORT function will retrieve the query for a given interactive report with bind variable info, I can't find a comparable function for Faceted Search reports, but that would be ideal. I'm certain that I can write PL/SQL that would generate the SQL and binds for this one report, but a more generic solution would be much better., I don't really want to re-invent the wheel for every Faceted Search report that I create.