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

If you are using sunspot solr on rails, sunspot can reindex all the data from the database into solr. However, solr standalone would not know where to pull the data to reindex. You would need a backup of the data.