Merge pull request #31232 from tiant167/master

[@types/mongoose] add autoIndex at top level of connection options

types/mongoose/index.d.ts

@@ -424,6 +424,7 @@ declare module "mongoose" {
        */
       autoIndex?: boolean;
     };
+    autoIndex?: boolean;
   }
 
   /** See the node-mongodb-native driver instance for options that it understands. */

types/mongoose/mongoose-tests.ts

@@ -27,7 +27,8 @@ const connection2: Promise<mongoose.Mongoose> = mongoose.connect(connectUri, {
   bufferCommands: false,
   useNewUrlParser: true,
   useFindAndModify: true,
-  useCreateIndex: true
+  useCreateIndex: true,
+  autoIndex: true
 });
 const connection3: null = mongoose.connect(connectUri, function (error) {
   error.stack;