Stopping / Starting IndexReaders in Solr 1.3+

[Kay Kay]

For a particular application of ours - we need to suspend the Solr 
server from doing any query operation ( IndexReader-s) for sometime, and 
then after sometime in the near future ( in minutes ) - reinitialize / 
warm IndexReaders once again and get moving.

It is a little bit different from <optimize > since this server is only 
supposed to read the data and not add create segments . But we want to 
suspend it as an initial test case for one of our load balancers. 

(Restarting Solr is an option though we want to get to that as a last 
resort ).