const { MongoClient } = require("mongodb"); // Replace the uri string with your connection string. const uri =   "mongodb://cluster_url?retryWrites=true&writeConcern=majority"; const client = new MongoClient(uri); async function run() {   try {     await client.connect();     const database = client.db("test");     const movies = database.collection("users");     console.log("Starting batched async stress test...");     const batchSize = 1000; // Number of documents per batch     const totalDocs = 380000; // Total number of documents to insert     // Create all documents     const documents = Array.from(\{ length: totalDocs } , (_, i) => ({       name: `movie ${i}`,       "rando_long_data": "a".repeat(1000),     }));     // Split documents into batches     const batches = [];     for (let i = 0; i < documents.length; i += batchSize) {       batches.push(documents.slice(i, i + batchSize));     }     // Insert batches concurrently     await Promise.all(       batches.map(async (batch, index) => {         await movies.insertMany(batch);         console.log(`Batch ${index + 1}/${batches.length} inserted successfully.`);       })     );     console.log("All batches inserted successfully!");   } catch (error) {     console.error("Error during stress test:", error);   } finally {     await client.close();   } } run().catch(console.dir);   Run a primary shard node without forked node and no log path EG:  mongod --shardsvr --replSet server15 --dbpath /data/sharddb --bind_ip_all --port 27018