How to recover from Solr deleted index files?

Question

When I delete solr\'s index files on disk, (found in /solr/data/index and solr/data/spellchecker), solr throws an exception whenever I try to make

Answer 1

Exception FileNotFoundException signals that an attempt to open the file denoted by a specified pathname has failed. So either your index is invalid or corrupted.

NIOFSDirectory class is used for reading and writing index files. The directory is created at the named location if it does not yet exist.

So you should probably:

1. Delete the index directory or restore data from backups.
2. Restart the server (or at least the reload the config).