code: function indexInformation(coll, options, callback) {
    indexInformationDb(coll.s.db, coll.s.name, options, callback);
  }
docs: Retrieve this collection's index info.
  
  @method
  @param {Collection} a Collection instance.
  @param {object} [options] Optional settings. See Collection.prototype.indexInformation for a list of options.
  @param {Collection~resultCallback} [callback] The command result callback