6. The method of claim 5 , further comprising the master search node registering with the message provider to listen to the index update event produced by the first slave search node.
6. The method of claim 5 , further comprising the master search node registering with the message provider to listen to the index update event produced by the first slave search node. 7. The method of claim 6 , wherein the first slave search node periodically polls the master search node to copy the index directory information in order to update the local copy of the first slave search node.