I'm working on trying to get Recoll to work with the web frontend. I've had great luck with it on the desktop, so I'm trying to reproduce that usability in UnRAID. I've got equal or better functionality on my new NAS versus my old Synology, except for full text search. Unfortunately Recoll isn't super Docker friendly as it's got a lot of dependencies and requires a cronjob to update its indexes. None of that is insurmountable but it certainly makes it a lot more difficult than a "plug and play" type solution.