Fix for ALF-2329: Parameter to automatically remove the existing index directories before doing a FULL re-index

- full reindex now deletes any existing DM and AVM indexes
- the index directory is tidied up int eh backround which may take some time
- includes fix to check async snapshots are in the index (it was checking sync twice ...)

git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@19922 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261

source/java/org/alfresco/repo/search/AVMSnapShotTriggeredIndexingMethodInterceptor.java

@@ -519,4 +519,14 @@ public class AVMSnapShotTriggeredIndexingMethodInterceptor implements MethodInte
         return null;
     }
 
+    public void deleteIndex(String store)
+    {
+        StoreRef storeRef = AVMNodeConverter.ToStoreRef(store);
+        Indexer indexer = indexerAndSearcher.getIndexer(storeRef);
+        if (indexer instanceof AVMLuceneIndexer)
+        {
+            AVMLuceneIndexer avmIndexer = (AVMLuceneIndexer) indexer;
+            avmIndexer.deleteIndex(storeRef);
+        }
+    }
 }