How to remove old Hibernate Search index

I use Hibernate search for full text search in my web application. I have button for index creation in admin panel. I开发者_运维技巧 do it by this code:

                fullTextSession.createIndexer()
                .purgeAllOnStart(true)
                .optimizeAfterPurge(true)
                .optimizeOnFinish(true)
                .batchSizeToLoadObjects( 25 )
                .threadsToLoadObjects( 5 )
                .threadsForSubsequentFetching( 20 )
                .startAndWait();

If index was build correctly and then I push this button again old index files still on disk and program creates new index. And so on. Can you help me remove old index files before creating new?

I do a similar thing but only when I shut my app down do I remove the indexes and then I set them up again on startup.

Have you tried calling purgeAll() instead of purgeAllOnStart()? That is what I call on app shutdown and it works. To be safe, after I purge the indexes I actually delete my index directory and all files / folders it contains from disk as well.