Comment 5 for bug 1702878

sudo apt install tracker helped and now the icon is no longer greyed out. I checked the bug you linked and I definitely think that search in new Ubuntu Session needs to be improved, Unity dash searched for all my files easily and they were always very quickly accessible, KDE does the same with Baloo indexing, everything is easily found in KDE menu search. That is the feature I miss the most from Unity on this new Gnome based session, that and minimize on click option for dock.