[{"_id":{"$oid":"64d9f2bb7a587e250e3acb45"},"isActive":true,"name":"Test1"},{"_id":{"$oid":"64dc481d37a38cb58de04ffb"},"isActive":true,"name":"Test2"},{"_id":{"$oid":"64d9dd9f7a587e250e3ac95b"},"isActive":true,"name":"Test1-1","parentId":{"$oid":"64d9f2bb7a587e250e3acb45"}},{"_id":{"$oid":"64dca02f0ff1ddfc4e40a874"},"isActive":true,"name":"Test1-1-1","parentId":{"$oid":"64d9dd9f7a587e250e3ac95b"}}]

db.collection.aggregate([{$graphLookup:{from:"collection",startWith:"$_id",connectFromField:"_id",connectToField:"parentId",as:"childrens",restrictSearchWithMatch:{isActive:true},depthField:"level"}},{$unwind:{path:"$childrens",preserveNullAndEmptyArrays:true}},{$sort:{"childrens.level":-1}},{$group:{_id:"$_id",parentId:{$first:"$parentId"},isActive:{$first:"$isActive"},name:{$first:"$name"},childrens:{$push:"$childrens"}}},{$addFields:{childrens:{$reduce:{input:"$childrens",initialValue:{level:-1,presentChild:[],prevChild:[]},"in":{$let:{vars:{prev:{$cond:[{$eq:["$$value.level","$$this.level"]},"$$value.prevChild","$$value.presentChild"]},current:{$cond:[{$eq:["$$value.level","$$this.level"]},"$$value.presentChild",[]]}},"in":{level:"$$this.level",prevChild:"$$prev",presentChild:{$concatArrays:["$$current",[{$mergeObjects:["$$this",{childrens:{$filter:{input:"$$prev",as:"e",cond:{$eq:["$$e.parentId","$$this._id"]}}}}]}]]}}}}}}}},{$addFields:{childrens:"$childrens.presentChild"}}])