Implements hook_search_status().
function node_search_status() {
$total = db_query('SELECT COUNT(*) FROM {node}')
->fetchField();
$remaining = db_query("SELECT COUNT(*) FROM {node} n LEFT JOIN {search_dataset} d ON d.type = 'node' AND d.sid = n.nid WHERE d.sid IS NULL OR d.reindex <> 0")
->fetchField();
return array(
'remaining' => $remaining,
'total' => $total,
);
}