(PECL solr >= 0.9.2)
SolrClient::rollback — Rollbacks all add/deletes made to the index since the last commit
Rollbacks all add/deletes made to the index since the last commit. It neither calls any event listeners nor creates a new searcher.
此函数没有参数。
Returns a SolrUpdateResponse on success or throws a SolrClientException on failure.