/**
* Create or update indexes, it needs to be called a least one time and when have some
* operation that not use this lib. Index operation are executed in background.
*
* @param MongoCollection $collection
* @param String $relType
*/
public static function performIndexes(MongoCollection $collection, $relType)
{
$relType = strtolower($relType);
$prefix = Instance::REL_PREFIX . $relType . '.';
$collection->ensureIndex(['_id' => 1, $prefix . '_collection' => 1], ['background' => true]);
// for incoming searches
$collection->ensureIndex(['_id' => 1, $prefix . '_id' => 1, $prefix . '_collection' => 1], ['unique' => true, 'background' => true]);
// for ensure integrity
}
