Hi,

I tried to export to pdf with the following:

#+LATEX_HEADER: \usepackage{polyglossia}
> #+LATEX_HEADER: \usepackage{fontspec}
> #+LATEX_COMPILER: xelatex (also tried with lualatex)
> #+LATEX_HEADER:  \setmainlanguage{english}
> #+LATEX_HEADER:  \setotherlanguage{sanskrit}
> #+LATEX_HEADER:   \newfontfamily\devanagarifont{Noto Serif Devanagari}
>
> स्वस्ति सत्यं वचति
>

but it exports alright to odt, and even pandoc exports alright directly
from org file to docx file, but the Sanskrit/Devanagari fonts are skipped
(blank) in pdf output when exported directly from org file with C-c C-e l o.

Already tried with the solutions provided in
https://emacs.stackexchange.com/questions/27576/exporting-devanagarai-text-from-org-mode-to-latex,
but there are no such options (variables defined) after 'M-x
customize-group' available.
-- 
Cheers,
/z