"nepomukbaloomigrator" shall be the tool to migrate from Nepomuk to Baloo [1], but it seems to be missing in Gentoo's ebuilds for KDE 4.12.95. [1] http://dot.kde.org/2014/03/12/applications-413-coming-soon-help-us-test
johu@elia ~/src/gentoo/qt $ equery f nepomuk-core | grep baloo /usr/bin/nepomukbaloomigrator /usr/lib/debug/usr/bin/nepomukbaloomigrator.debug /usr/share/autostart/nepomukbaloomigrator.desktop
[I] kde-base/nepomuk-core Installed versions: 4.12.95(4/4.12)^t[1](12:55:16 22/03/14)(epub exif ffmpeg pdf taglib -aqua -debug) $ q list nepomuk-core | grep baloo <no output>
Seems optional, i will add an default enabled use flag.
Thanks for reporting, well spotted :). This is fixed in kde overlay. Please sync. http://git.overlays.gentoo.org/gitweb/?p=proj/kde.git;a=commit;h=ae4642d92fb29dd5956952102d6fc0624e352b8f