MongoDB - use maxDistance $geoNear between stored docs without specifing coordinates in query

Question

lets say is have multiple docs with geo coordinates in mongodb

• {"_id" : .., "userID" : "1", "point: {"type" : "Point", "coordinates" : [ 8.8502715, 45.6114064 ]}}
• {"_id" : .., "userID" : "1", "point: {"type" : "Point", "coordinates" : [ 8.8402715, 45.6214064 ]}}
• {"_id" : .., "userID" : "2", "point: {"type" : "Point", "coordinates" : [ 8.8512715, 45.6124064 ]}} {"_id" : .., "userID" : "3", "point: {"type" : "Point", "coordinates" : [ 8.8512715, 45.6124064 ]}}

and i want to run a test every 5 minutes and get all users that were in proximity of 20 meters with each other (so points of the same userid should be ignored. it will check maxDistance only between docs that have diffrent userid ). is there any query i can run that will provide all the points? if not, should i check for diffrent db to store points that i will be able to run this type of query?

Thanks in advance?