5. The method of claim 3 , further comprising, in response to a notification from the message provider, retrieving the index update event from the message queue by the master search node and updating the master search index.
5. The method of claim 3 , further comprising, in response to a notification from the message provider, retrieving the index update event from the message queue by the master search node and updating the master search index. 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.