Index: lucene/src/java/org/apache/lucene/index/DocumentsWriter.java
===================================================================
--- lucene/src/java/org/apache/lucene/index/DocumentsWriter.java	(revision 1100130)
+++ lucene/src/java/org/apache/lucene/index/DocumentsWriter.java	(working copy)
@@ -188,7 +188,7 @@
     this.infoStream = infoStream;
     final Iterator<ThreadState> it = perThreadPool.getAllPerThreadsIterator();
     while (it.hasNext()) {
-      it.next().perThread.docState.infoStream = infoStream;
+      it.next().perThread.setInfoStream(infoStream);
     }
   }
 
Index: lucene/src/java/org/apache/lucene/index/DocumentsWriterPerThread.java
===================================================================
--- lucene/src/java/org/apache/lucene/index/DocumentsWriterPerThread.java	(revision 1100130)
+++ lucene/src/java/org/apache/lucene/index/DocumentsWriterPerThread.java	(working copy)
@@ -163,7 +163,7 @@
   boolean hasAborted = false; // True if the last exception throws by #updateDocument was aborting
 
   private FieldInfos fieldInfos;
-  private final PrintStream infoStream;
+  private PrintStream infoStream;
   private int numDocsInRAM;
   private int flushedDocCount;
   DocumentsWriterDeleteQueue deleteQueue;
@@ -493,4 +493,9 @@
     }
     
   };
+  
+  void setInfoStream(PrintStream infoStream) {
+    this.infoStream = infoStream;
+    docState.infoStream = infoStream;
+  }
 }