Drupal Panel Output for Indexing

/**
 * Add a node, using a panel node template override, into Search index
 * - search_api
 * - search_api_solr
 */

/**
 * Implements hook_entity_property_info_alter().
 */
function MY_SEARCH_entity_property_info_alter(&$info) {
  $info['node']['properties']['panel_node'] = array(
    'type' => 'text',
    'label' => t('Panel Node Render'),
    'sanitized' => TRUE,
    'getter callback' => 'MY_SEARCH_panel_node_getter_callback',
  );
}

function MY_SEARCH_panel_node_getter_callback($node) {
    
    $nodes_list = MY_SEARCH_panel_nodes_list();

    if (in_array($node->type, $nodes_list)) {

        // @see http://drupal.stackexchange.com/questions/47731/how-to-print-a-panel-page

        $task = page_manager_get_task('node_view');
        
        // Load the node into a context.
        ctools_include('context');
        ctools_include('context-task-handler');
        $contexts = ctools_context_handler_get_task_contexts($task, '', array($node));
        
        $output = ctools_context_handler_render($task, '', $contexts, array($node->nid));
        
        if ($output !== FALSE) {
            if (is_array($output)) {
                $content = $output['content'];
                return drupal_render($content);
            }
            else {
                return $output;
            }
        }
        // Otherwise, fall back.
        return drupal_render(node_view(node_load($node->nid)));
    }
    
    return NULL;
}

function MY_SEARCH_panel_nodes_list() {
  
    return array(
        'A_CONTENT_TYPE',
        'A_CONTENT_TYPE_2'
    );
  
}