[{"_id":ObjectId("5ea3138daee55c0001eac29f"),"linkRole":[{"role":"admin","Organization":"a32cc286-256b-40e5-fc5d-5ecbdc341ab1"},{"role":"superadmin","Organization":"a32cc286-256b-40e5-fc5d-5ecbdc341ab1"},{"role":"user","Organization":"a32cc286-256b-40e5-fc5d-5ecbdc341ab1"},{"role":"user","Organization":"a32cc286-256b-40e5-fc5d-5ecbdc341ab1"},{"role":"admin","Organization":"dd79f23d-2382-4eb7-a2f3-634890eba0bb"},{"role":"superadmin","Organization":"dd79f23d-2382-4eb7-a2f3-634890eba0bb"}]}]

db.collection.aggregate([{"$unwind":"$linkRole"},{"$group":{"_id":{"Organization":"$linkRole.Organization","role":"$linkRole.role"}}},{"$project":{"_id":0,"role":"$_id.role","Organization":"$_id.Organization"}}])