Mongodb批量写入错误

db.collection.createIndex({ field: 1 }, { unique: true });
db.collection.insertMany([{ field: "value" }, { field: "value2" }], { ordered: false });

const MongoClient = require('mongodb').MongoClient;
const client = new MongoClient('mongodb://localhost:27017', { useNewUrlParser: true, useUnifiedTopology: true });

async function run() {
  try {
    await client.connect();
    const database = client.db('test');
    const collection = database.collection('documents');

    const documents = [{ a: 1 }, { a: 2 }];
    let retries = 3;
    while (retries) {
      try {
        await collection.insertMany(documents);
        break;
      } catch (err) {
        retries -= 1;
        if (retries === 0) throw err;
      }
    }
  } finally {
    await client.close();
  }
}

run().catch(console.dir);

use admin
db.grantRolesToUser("username", [{ role: "readWrite", db: "test" }])