db={"Demo":[{"_id":{"$oid":"62165ded19477d42a62629e0"},"Name":"Demo1","RuleId":{"$oid":"62165c6242615a8f9341495b"}}],"Rule":[{"_id":{"$oid":"62165c5c42615a8f93414959"},"Name":"Rule1","ParentRuleId":{"$oid":"000000000000000000000000"}},{"_id":{"$oid":"62165c6142615a8f9341495a"},"Name":"Rule2","ParentRuleId":{"$oid":"62165c5c42615a8f93414959"}},{"_id":{"$oid":"62165c6242615a8f9341495b"},"Name":"Rule3","ParentRuleId":{"$oid":"62165c6142615a8f9341495a"}}]}

db.Demo.aggregate([{"$match":{"Name":"Demo1"}},{"$graphLookup":{"from":"Rule","startWith":"$RuleId","connectFromField":"ParentRuleId","connectToField":"_id","as":"rules","depthField":"recursiveDepth"}},{"$unwind":"$rules"},{"$sort":{"rules.recursiveDepth":1}},{"$group":{"_id":"$_id","Name":{"$first":"$Name"},"Rule Hierarchies":{"$push":"$rules.Name"}}},{"$unset":"_id"}])