Have you configured the search env for CSC, you need to set the searchEngine directory and the deployShare directory for the index files, below you can find the information related to the same in the documentation
Thanks for your reply Rajesh.
I have completed all the steps in that page. But in next page steps, I have done it through BCC of Search management server.
Is that correct? Still I am getting that message *"Search is unavailable while maintenance is being performed. Contact your system administrator for more details. "*
But i am able to find the order thro order id in CSC.
awaiting for your reply.