This file is indexed.

/usr/share/im-config/data/21_ibus.rc is in im-config 0.29-1ubuntu12.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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# start IBus
# vim: set sts=4 expandtab:

if [ "$IM_CONFIG_PHASE" = 2 ]; then
# start IBus daemon
/usr/bin/ibus-daemon --daemonize --xim
fi

if [ "$IM_CONFIG_PHASE" = 1 ]; then
# set variables for the plain XIM
XMODIFIERS=@im=ibus

GTK_IM_MODULE=xim
# use immodule only when available for both GTK 2.0 and 3.0
IM_CONFIG_MARKER2=0
for IM_CONFIG_MARKER in /usr/lib/*/gtk-2.0/*/immodules/im-ibus.so \
                        /usr/lib/gtk-2.0/*/immodules/im-ibus.so ; do
    if [ -e $IM_CONFIG_MARKER ]; then
        IM_CONFIG_MARKER2=1
        break
    fi
done

IM_CONFIG_MARKER3=0
for IM_CONFIG_MARKER in /usr/lib/*/gtk-3.0/*/immodules/im-ibus.so \
                        /usr/lib/gtk-3.0/*/immodules/im-ibus.so ; do
    if [ -e $IM_CONFIG_MARKER ]; then
        IM_CONFIG_MARKER3=1
        break
    fi
done
if [ $IM_CONFIG_MARKER2 = 1 ] && [ $IM_CONFIG_MARKER3 = 1 ] ; then
    GTK_IM_MODULE=ibus
fi

QT4_IM_MODULE=xim
# use immodule when available for Qt4 (Qt3 has been long dead)
for IM_CONFIG_MARKER in /usr/lib/*/qt4/plugins/inputmethods/libqtim-ibus.so\
                        /usr/lib/qt4/plugins/inputmethods/libqtim-ibus.so ; do
    if [ -e $IM_CONFIG_MARKER ]; then
        QT4_IM_MODULE=ibus
        break
    fi
done
QT_IM_MODULE=xim
# use immodule when available for Qt5
for IM_CONFIG_MARKER in /usr/lib/*/qt5/plugins/platforminputcontexts/libibusplatforminputcontextplugin.so ; do
    if [ -e $IM_CONFIG_MARKER ]; then
        QT_IM_MODULE=ibus
        break
    fi
done

CLUTTER_IM_MODULE=xim
# use immodule when available for clutter
for IM_CONFIG_MARKER in /usr/lib/*/clutter-imcontext/immodules/im-ibus.so \
                        /usr/lib/clutter-imcontext/immodules/im-ibus.so; do
    if [ -e $IM_CONFIG_MARKER ]; then
        CLUTTER_IM_MODULE=ibus
        break
    fi
done
fi