Windows 11 - File Explorer - Search Contents fails

After trying to figure out some pattern as to why Win11 would find a small number of docx by content, but not others, I came up with the ultimate "Whuh?" I have a document where I searches on ten different words in it. It found the document by four of them, but not six others. The SAME dang document.

I've brought the computer to two specialist shops (where multiple people worked on it) and had one man work remotely. No one could solve this. They also tried running it from an external hard drive off Win10 and the same problem occurred. That was a surprise because I felt sure it was all about 11. That made me think going back wouldn't help.

In the end, at least for now, I'm giving up and going to use an open source product called DocFetcher. It was free. I downloaded it onto 11, let it do its indexing on a large sample of data and it found everything successfully, at least in the testing that I did.

Very frustrating and disappointing, but I'd lose weeks of customizing to go back to 10 with no guarantee that the problem will go away. Just hoping that Microsoft is aware and works on it and suddenly, sometime, in some update, it starts working.

One person had a theory that it might work better on computers that upgrade to 11 than ones that start on 11...that some little file might be in 10 and stay there but be missing in new installations of straight 11. No idea if that has merit.

Going back to 10 doesn't appeal to me for another reason: Who wants a new computer with an operating system that Microsoft has promised to end support for in only 2.5 years? And although upgrading could work later, I wouldn't know when that would be and we've all heard upgrade nightmare stories. I should be able to use 11 now if it's supposedly ready-for-prime-time. I curse at the TV every time I see a Win11 commercial. Wish we'd never left 7! It was all I ever wanted, other than it no longer being supported!