Issue with $exists operator

I have got an exception with “bad operator” using $exists operator in my query.
I have next query: {$match: {“id”: {"$ne": 1}, “tagGroup”: 16, “tagElement”: 16, value: /‘LOUWS^AARON’/{$exists: true}}}

Error: unknown operator: $exists:: generic server error

You are missing the name of the field for which you want to test for $exists.