Information about options for all kinds of purposes will be held here. @code 'option_name' => array(
),
array Returns the options of this handler/plugin.
Overrides PluginBase::defineOptions
protected function defineOptions() {
  $options = parent::defineOptions();
  $options['submit_button'] = array(
    'default' => 'Apply',
    'translatable' => TRUE,
  );
  $options['reset_button'] = array(
    'default' => FALSE,
    'bool' => TRUE,
  );
  $options['reset_button_label'] = array(
    'default' => 'Reset',
    'translatable' => TRUE,
  );
  $options['exposed_sorts_label'] = array(
    'default' => 'Sort by',
    'translatable' => TRUE,
  );
  $options['expose_sort_order'] = array(
    'default' => TRUE,
    'bool' => TRUE,
  );
  $options['sort_asc_label'] = array(
    'default' => 'Asc',
    'translatable' => TRUE,
  );
  $options['sort_desc_label'] = array(
    'default' => 'Desc',
    'translatable' => TRUE,
  );
  return $options;
}