The Recurrent Yiddish Song?

I found that song haunting. I know some German, which helped me understand some of the words, but not enough to catch the significance of it to the story.

Can anyone help with that?

Oh, I found this:

Dem Milners Trern
Written by Mark Warschafsky
Performed by Sidor Belarsky

Here it is with a translation. It does relate to the film:

Oh how many years have passed since i've been a miller here the wheels turn the years pass i'm growing old and grey. There are days i want to remember if i had a little happiness? the wheels turn the years pass i don't get any answers. I heard it said they want to drive me out away from my village and away from the mill the wheels turn the years pass without an end, without a goal. Where will i live? who will care for me? i'm already old, i'm already tired the wheels turn the years pass and with them, also go the jews. (or more poetically, as the mloteks translated: and soon no trace of the jews will remain)

Link:
https://youtu.be/EwSvcv-8DT8