if not deleting an index, don't delete the gateway data...

modules/elasticsearch/src/main/java/org/elasticsearch/index/gateway/fs/FsIndexGateway.java

@@ -86,6 +86,9 @@ public class FsIndexGateway extends AbstractIndexComponent implements IndexGatew
     }
 
     @Override public void close(boolean delete) {
+        if (!delete) {
+            return;
+        }
         try {
             String[] files = indexGatewayHome.list();
             if (files == null || files.length == 0) {