This file is indexed.

/usr/share/ltsp/plugins/ltsp-build-client/Debian/010-distribution-specific is in ltsp-server 5.4.2-6+deb7u1.

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

The actual contents of the file can be viewed below.

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case "$MODE" in
    before-install)
        case "$DIST" in
            sid)
                echo "`eval_gettext "NOTE: disabling security APT source for sid.  It does not exist."`"
                SECURITY_MIRROR=none
                ;;
        esac
        ;;
esac