move HDFS-9621 from trunk to 2.9.0 in CHANGES.txt.

hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt

@@ -406,9 +406,6 @@ Trunk (Unreleased)
     HDFS-9615. Fix variable name typo in DFSConfigKeys. (Ray Chiang via
     Arpit Agarwal)
 
-    HDFS-9621. getListing wrongly associates Erasure Coding policy to pre-existing
-    replicated files under an EC directory. (jing9)
-
     BREAKDOWN OF HDFS-7285 SUBTASKS AND RELATED JIRAS
 
       HDFS-7347. Configurable erasure coding policy for individual files and
@@ -940,6 +937,9 @@ Release 2.9.0 - UNRELEASED
 
   BUG FIXES
 
+    HDFS-9621. getListing wrongly associates Erasure Coding policy to pre-existing
+    replicated files under an EC directory. (jing9)
+
 Release 2.8.0 - UNRELEASED
 
   NEW FEATURES