The current version of the stop words

https://github.com/mongodb/mongo/blob/master/src/mongo/db/fts/stop_words_german.txt

contains nounds which shouldn't be considered stop words. Examples:

"nutzung" (usage)
"schreiben" (letter / writing)
"arbeiten" (works), "mann" (man)
"ehe" (marriage)
"frau" (woman)
"bedarf" (need)
"ende" (end)
"fall" (case)