We have search service application running with 11 Million items on the two search servers in live environment.
We have to maintain the same search application in DR environment as well, so we are planing to use Restore-SearchServiceApplication command with powershell.
This will take the complete index backup. So we believe, we can directly restore this search service back to DR server so that search service is available in DR servers.
Please let us know whether re indexing needed again post restoration of search application in DR server.