/**
* Reindex documents from an old index to a new index.
*
* @link https://www.elastic.co/guide/en/elasticsearch/guide/master/reindex.html
*
* @param \Elastica\Index $oldIndex
* @param \Elastica\Index $newIndex
* @param array $options keys: CrossIndex::OPTION_* constants
*
* @return \Elastica\Index The new index object
*/
public static function reindex(Index $oldIndex, Index $newIndex, array $options = array())
{
// prepare search
$search = new Search($oldIndex->getClient());
$options = array_merge(array(self::OPTION_TYPE => null, self::OPTION_QUERY => new MatchAll(), self::OPTION_EXPIRY_TIME => '1m', self::OPTION_SIZE_PER_SHARD => 1000), $options);
$search->addIndex($oldIndex);
if (isset($options[self::OPTION_TYPE])) {
$type = $options[self::OPTION_TYPE];
$search->addTypes(is_array($type) ? $type : array($type));
}
$search->setQuery($options[self::OPTION_QUERY]);
// search on old index and bulk insert in new index
$scanAndScroll = new ScanAndScroll($search, $options[self::OPTION_EXPIRY_TIME], $options[self::OPTION_SIZE_PER_SHARD]);
foreach ($scanAndScroll as $resultSet) {
$bulk = new Bulk($newIndex->getClient());
$bulk->setIndex($newIndex);
foreach ($resultSet as $result) {
$action = new Bulk\Action();
$action->setType($result->getType());
$action->setId($result->getId());
$action->setSource($result->getData());
$bulk->addAction($action);
}
$bulk->send();
}
$newIndex->refresh();
return $newIndex;
}