code: function validateCollection(admin, collectionName, options, callback) {
    const command = { validate: collectionName };
    const keys = Object.keys(options);
  
    // Decorate command with extra options
    for (let i = 0; i < keys.length; i++) {
      if (options.hasOwnProperty(keys[i]) && keys[i] !== 'session') {
        command[keys[i]] = options[keys[i]];
      }
    }
  
    executeCommand(admin.s.db, command, options, (err, doc) => {
      if (err != null) return callback(err, null);
  
      if (doc.ok === 0) return callback(new Error('Error with validate command'), null);
      if (doc.result != null && doc.result.constructor !== String)
        return callback(new Error('Error with validation data'), null);
      if (doc.result != null && doc.result.match(/exception|corrupt/) != null)
        return callback(new Error('Error: invalid collection ' + collectionName), null);
      if (doc.valid != null && !doc.valid)
        return callback(new Error('Error: invalid collection ' + collectionName), null);
  
      return callback(null, doc);
    });
  }
docs: Validate an existing collection
  
  @param {Admin} a collection instance.
  @param {string} collectionName The name of the collection to validate.
  @param {Object} [options] Optional settings. See Admin.prototype.validateCollection for a list of options.
  @param {Admin~resultCallback} [callback] The command result callback.