Better Instant Search for Confluence

Does'nt seem to index properly european languages/characters. I have a french text "intervention prévue", found by the standard confluence search, and Better search gives 0 result...

I have no idea what the real advantage of this app is supposed to be. Ok, I see a short text passage in addition to the link, but it doesn't really make sense without the whole paragraph either. But the link then only calls up the page and not directly the location of the find. So when I am then on the page I have to activate the browser search again.