review comment - move index closure to finally

indexing-hadoop/src/main/java/io/druid/indexer/IndexGeneratorJob.java

@@ -283,7 +283,7 @@ public class IndexGeneratorJob implements Jobby
       final AggregatorFactory[] aggs = config.getSchema().getDataSchema().getAggregators();
 
       IncrementalIndex index = makeIncrementalIndex(bucket, aggs);
-
+      try {
         File baseFlushFile = File.createTempFile("base", "flush");
         baseFlushFile.delete();
         baseFlushFile.mkdirs();
@@ -327,6 +327,7 @@ public class IndexGeneratorJob implements Jobby
               }
             }
             );
+            // close this index and make a new one
             index.close();
             index = makeIncrementalIndex(bucket, aggs);
 
@@ -386,13 +387,16 @@ public class IndexGeneratorJob implements Jobby
           }
           );
         }
-      index.close();
         serializeOutIndex(context, bucket, mergedBase, Lists.newArrayList(allDimensionNames));
-
         for (File file : toMerge) {
           FileUtils.deleteDirectory(file);
         }
       }
+      finally {
+        index.close();
+      }
+
+    }
 
     private void serializeOutIndex(Context context, Bucket bucket, File mergedBase, List<String> dimensionNames)
         throws IOException