Thread:Extension talk:Lucene-search/0 search results returned rebuild of index required

I have run MWSearch/Lucene/OAIrepo for about 6 months now and it has gone fairly smoothly and now (within the last 2 weeks) the search just returns 0 results. I attempted to do an  and this did not resolve the issue, iv created a log for lucene via my init script and i see the search is dispatched to the org.wikimedia.lsearch.search.SearchEngine but I don't really have a lot of purview into that portion of the application. If I delete the indexes dir and then do a build this resolves the issue, we are running Linux/Apache with a cronjob to update the search index. I am mainly looking for what are additional troubleshooting steps I can take to possible resolve this as this is a knowledge base for a front line support team and id rather not script a bandaid if I can avoid it