Create a mongodb sessions 

 const session = db.getMongo().startSession()

 Step 2 

 session.startTransaction() 

 step 3 

 Database name: blogger 

 collection name: 1. users, 2. blogs 

Map our collections in to session transaction by pointers 

 const usersCollection = session.getDatabase("blogger").users

 const postsCollection = session.getDatabase("blogger").posts 

 Queries to delete usersCollection.delete({_id: ObjectId('....')}) 

 Step 4: session.commitTransaction()