code: function indexInformation(db, name, options, callback) {
    // If we specified full information
    const full = options['full'] == null ? false : options['full'];
  
    // Did the user destroy the topology
    if (db.serverConfig && db.serverConfig.isDestroyed())
      return callback(new MongoError('topology was destroyed'));
    // Process all the results from the index command and collection
    function processResults(indexes) {
      // Contains all the information
      let info = {};
      // Process all the indexes
      for (let i = 0; i < indexes.length; i++) {
        const index = indexes[i];
        // Let's unpack the object
        info[index.name] = [];
        for (let name in index.key) {
          info[index.name].push([name, index.key[name]]);
        }
      }
  
      return info;
    }
  
    // Get the list of indexes of the specified collection
    db
      .collection(name)
      .listIndexes(options)
      .toArray((err, indexes) => {
        if (err) return callback(toError(err));
        if (!Array.isArray(indexes)) return handleCallback(callback, null, []);
        if (full) return handleCallback(callback, null, indexes);
        handleCallback(callback, null, processResults(indexes));
      });
  }
docs: Retrieves this collections index info.
  
  @method
  @param {Db} db The Db instance on which to retrieve the index info.
  @param {string} name The name of the collection.
  @param {object} [options] Optional settings. See Db.prototype.indexInformation for a list of options.
  @param {Db~resultCallback} [callback] The command result callback