As per https://forum.openoffice.org/en/forum/viewtopic.php?f=9&t=83419, Apache Open Office doesn't support - or -- convert-to option, in following command.
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soffice --norestore --nofirststartwizard -nologo --headless --convert-to xlsx:"Calc MS Excel 2007 XML" <input-file-path> --outdir <output-path>
Above and other commands like soffice -calc are going in non-responding mode, without any error/warning message.
What are our options, to convert documents in such environment through command line.