\input luaotfload.sty

\font\testa={name:dejavusans:script=arab;language=ara;+anum}
\font\testp={name:dejavusans:script=arab;language=far;+anum}
\font\tests={name:dejavusans:script=arab;language=snd;+anum}
\font\testu={name:dejavusans:script=arab;language=urd;+anum}

\testa 0123456789\par
\testp 0123456789\par
\tests 0123456789\par
\testu 0123456789\par
\bye
