NetWorker: File-system recovery is failing with error "file Index is missing"

An error is returned stating that the file index is missing when performing file level recovery of a NetWorker client from the NetWorker Management Console (NMC):

Figure 1: Error Message: File Index is Missing.

The client file index folder is missing or empty:

Linux: /nsr/index/CLIENT-NAME
Windows: C:\Program Files\EMC NetWorker\nsr\index\CLIENT-NAME

Figure 2: Screenshot of Missing Client File Index Folder

On the NetWorker server, open an admin prompt and run as root:

nsrck -L7 client-name

nsradmin -p nsrexecd "nsrla"

Monitor the nsrck command output for any errors. Once completed, the client index folder should be repopulated and the data restore can be performed.