Have gone through the doc but it was not clear about the index Back up procedure. I tried the following way!
But still I cannot see any data flowing in new machine. Is there anything I missed?
Are you troubleshooting the migrated data to the new instance? or the new data flowing into the new instance?
I would go through the instance and see what settings the old instance is running.
etc/deployment-apps (if it is all one single system does everything?)
If this instance configurations managed from a deployment-server, then you can point the new instance to deployment-server and that will take care of some of the configurations.
If this also a search head, then check all your dashboards etc. to see if any hard coded urls with your old hostname etc.