(node:12618) DeprecationWarning: current Server Discovery and Monitor…

…ing engine is deprecated, and will be removed in a future version. To use the new Server Discover and Monitoring engine, pass option { useUnifiedTopology: true } to the MongoClient constructor. (DeviaVir#1975)

boot.js

@@ -58,7 +58,7 @@ module.exports = function (cb) {
       (authMechanism ? '&authMechanism=' + authMechanism : '' )
   }
 
-  require('mongodb').MongoClient.connect(connectionString, { useNewUrlParser: true }, function (err, client) {
+  require('mongodb').MongoClient.connect(connectionString, { useNewUrlParser: true, useUnifiedTopology: true}, function (err, client) {
     if (err) {
       console.error('WARNING: MongoDB Connection Error: ', err)
       console.error('WARNING: without MongoDB some features (such as backfilling/simulation) may be disabled.')