fix(index.d.ts): allow specifying weights as an IndexOption

Fix #10586

Author: vkarpov15

index.d.ts

@@ -1748,7 +1748,8 @@ declare module 'mongoose' {
     > = PopulatedType | RawId;
 
   interface IndexOptions extends mongodb.IndexOptions {
-    expires?: number | string
+    expires?: number | string;
+    weights?: AnyObject;
   }
 
   interface ValidatorProps {

test/typescript/schema.ts

@@ -67,7 +67,9 @@ const movieSchema = new Schema<Document<Movie>, Model<Document<Movie>>, Movie>({
 });
 
 movieSchema.index({ status: 1, 'actors.name': 1 });
-movieSchema.index({ title: 'text' });
+movieSchema.index({ title: 'text' }, {
+  weights: { title: 10 }
+});
 movieSchema.index({ rating: -1 });
 
 // Using `SchemaDefinition`