Magento 1 Lucene Search: Search is no longer returning search results. What’s wrong?

The biggest issue we see with Lucene Search is file permissions.

In this case you will want to follow these instructions:

1. Run: chmod –R 0777 [magento root]/var/extendware/ewlucene/ 
2. Run: php [magento root]/shell/extendware/ewlucene/reindex.php 
3. Run: chmod –R 0777 [magento root]/var/extendware/ewlucene/