DOCSP-32718: multikey code comments

source/code-snippets/indexes/multikey.js

@@ -1,35 +1,47 @@
+/* Create a multikey index */
+
+// Import the MongoClient type from the mongodb package.
 const { MongoClient } = require("mongodb");
 
-// Replace the following with your MongoDB deployment's connection
-// string.
+// Replace the placeholders with your credentials.
 const uri =
   "mongodb+srv://<user>:<password>@<cluster-url>?writeConcern=majority";
 
+// Create a new client and connect to MongoDB.
 const client = new MongoClient(uri);
 
 async function run() {
   try {
     // begin-idx
+    // Access the movies collection from the sample_mflix database.
     const database = client.db("sample_mflix");
     const movies = database.collection("movies");
 
-    // Create a multikey index on the "cast" field
+    // Create a multikey index on the "cast" field.
     const result = await movies.createIndex({ cast: 1 });
     // end-idx
 
+    // Print the result of creating the index.
     console.log(`Index created: ${result}`);
 
     // begin-query
+    // Create a filter to find documents where the cast field contains
+    // "Viola Davis".
     const query = { cast: "Viola Davis" };
+
+    // Create a projection to show only the cast and title fields.
     const projection = { _id: 0, cast: 1 , title: 1 };
 
+    // Perform a find operation with the preceding filter and projection.
     const cursor = movies
       .find(query)
       .project(projection);
     // end-query
 
   } finally {
+    // Close the client after the operation completes.
     await client.close();
   }
 }
+// Run the program and handle any errors that occur during execution.
 run().catch(console.dir);