Tracker SPARQL is now TinySPARQL. Tracker Miners is now LocalSearch. The old DBus and library APIs still work so there is no rush there. But the executables and git repositories need to be updated now. https://discourse.gnome.org/t/renaming-tracker-git-and-tracker-sparql-git-and-changing-default-branch/21461
This means the Nautilus flatpak will be able to use Tracker on systems which don't have Tracker 3 available on the host. It comes at a cost of increased resource consumption inside the Flatpak due running an extra indexer process there.