diff --git a/lucene/core/src/java/org/apache/lucene/index/ConcurrentMergeScheduler.java b/lucene/core/src/java/org/apache/lucene/index/ConcurrentMergeScheduler.java
index 6e930c48a204..57dc0c3ad7f2 100644
--- a/lucene/core/src/java/org/apache/lucene/index/ConcurrentMergeScheduler.java
+++ b/lucene/core/src/java/org/apache/lucene/index/ConcurrentMergeScheduler.java
@@ -117,7 +117,7 @@ public class ConcurrentMergeScheduler extends MergeScheduler {
   protected double targetMBPerSec = START_MB_PER_SEC;
 
   /** true if we should rate-limit writes for each merge */
-  private boolean doAutoIOThrottle = true;
+  private boolean doAutoIOThrottle = false;
 
   private double forceMergeMBPerSec = Double.POSITIVE_INFINITY;