After the recommendation here on the forum I got the excellent SearchIQ for searching my website. I wanted to update some wording on the websites and noticed that the SearchIQ index hasn't been updated for a while.
I asked the SearchIQ support and they told me that the sitemaps for the Foundation 6 website and for the Total CMS blog don't have a LastMod date. This is needed by SearchIQ to reindex.
Can the LastMod date be added? I'm not keen on updating the SearchIQ manually because I tend to forget such tasks.