Dedicated to the shift leaders at Ericsson
Do the needful is an Indian/English idiom meaning do whatever is necessary.
You might think the need for an Indian idiom in Poland is limited but people liaising with customers and colleagues in India frequently come across it.
So is it Indian, English or some other nationality?
To be sure about what's Indian you could always watch this sketch from the popular Indian/English comedy show Goodness gracious me! Indian! Now do the needful and watch it!