mogui commented on a change in pull request #679:
URL: https://github.com/apache/lucene/pull/679#discussion_r808924539



##########
File path: lucene/monitor/src/java/org/apache/lucene/monitor/Monitor.java
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@@ -125,14 +108,21 @@ public Monitor(Analyzer analyzer, Presearcher 
presearcher, MonitorConfiguration
    * Monitor's queryindex
    *
    * @param listener listener to register
+   * @throws IllegalStateException when Monitor is readonly
    */
   public void addQueryIndexUpdateListener(MonitorUpdateListener listener) {
-    listeners.add(listener);

Review comment:
       yes better




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