This file is indexed.

/etc/X11/Xsession.d/56xubuntu-session is in xubuntu-default-settings 16.04.6.

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

The actual contents of the file can be viewed below.

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# Set default environment vars in Xubuntu
if [ "$DESKTOP_SESSION" = xubuntu ]; then
    # Disable GTK 3.16 overlay scrollbars
    export GTK_OVERLAY_SCROLLING=0
    # QT5 apps to use GTK style
    export QT_STYLE_OVERRIDE=gtk
    # Workaround clutter issue (LP: #1462445)
    export CLUTTER_BACKEND=x11
fi