deleteByQuery does not work with SolrCloud

[YouPeng Yang]

Hi
  I am using SolrCloud withing solr 4.4 ,and I try the SolrJ API
deleteByQuery to delete the Index as :
 CloudSolrServer cloudServer = new CloudSolrServer(myZKhost)
 cloudServer.connect()
 cloudServer.setDefaultCollection
 cloudServer.deleteByQuery("indexname:shardTv_20131010");
 cloudServer.commit();

It seems not to work.
I also have do some google,unfortunately there is no help.

Do I miss anything?


Thanks

Regard