I’m not sure whether this would be useful to others, but it would certainly be useful for our use-cases on our current RAG-driven application project. Something like $incl and $excl would be great for filtering metadata on an index item such as descriptions, titles, etc. Something that matches substrings would be excellent. We don’t have control of the data we need to index and it isn’t viable to sanitize or optimize the data in order to use only the existing metadata filters. If it would be useful for us, perhaps it would be useful for others?