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/node/index/AVMFullIndexRecoveryComponent.java

@@ -287,6 +287,16 @@ public class AVMFullIndexRecoveryComponent extends AbstractReindexComponent
             else if (mode == RecoveryMode.FULL)
             {
                 logger.info("    Rebuilding index for " + store);
+                // delete existing index
+                RetryingTransactionCallback<Void> deleteWork = new RetryingTransactionCallback<Void>()
+                {
+                    public Void execute() throws Exception
+                    {
+                        avmSnapShotTriggeredIndexingMethodInterceptor.deleteIndex(store);
+                        return null;
+                    }
+                };
+                transactionService.getRetryingTransactionHelper().doInTransaction(deleteWork, true, true);
             }
             
             final int latest = avmService.getLatestSnapshotID(store);