How to remove index from mongodb?

@deron 

To remove an index from a MongoDB collection, you can use the dropIndex method of the collection object. Here is an example of how to use it:

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const MongoClient = require('mongodb').MongoClient;

async function removeIndex(indexName) {
  const client = new MongoClient('mongodb://localhost:27017');
  try {
    await client.connect();

    const db = client.db('mydb');
    const collection = db.collection('mycollection');

    await collection.dropIndex(indexName);
  } finally {
    await client.close();
  }
}

removeIndex('myindex');

This code creates a new MongoClient, connects to the server, and then gets a reference to the mycollection collection in the mydb database. It then calls the dropIndex method on the collection, passing in the name of the index to remove.

Note that the dropIndex method returns a Promise, so you will need to use await when calling it.

If you want to remove multiple indexes at once, you can pass an array of index names to the dropIndex method. For example:

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await collection.dropIndex(['index1', 'index2', 'index3']);

This will remove all the indexes with the names index1, index2, and index3 from the collection.