/**
 * Implements hook_field_display_alter().
 */
function {{ machine_name }}_field_display_alter(&$display, $context) {
  // Leave field labels out of the search index.
  // Note: The check against $context['entity_type'] == 'node' could be avoided
  // by using hook_field_display_node_alter() instead of
  // hook_field_display_alter(), resulting in less function calls when
  // rendering non-node entities.
  if ($context['entity_type'] == 'node' && $context['view_mode'] == 'search_index') {
    $display['label'] = 'hidden';
  }
}