Address review comments

Signed-off-by: Suraj Singh <surajrider@gmail.com>

Author: dreamer-89

server/src/main/java/org/opensearch/indices/replication/RemoteSegmentFileChunkWriter.java

@@ -122,4 +122,9 @@ public void writeFileChunk(
             reader
         );
     }
+
+    @Override
+    public void cancel() {
+        retryableTransportClient.cancel();
+    }
 }

server/src/main/java/org/opensearch/indices/replication/SegmentReplicationSourceHandler.java

@@ -189,7 +189,7 @@ public synchronized void sendFiles(GetSegmentFilesRequest request, ActionListene
     }
 
     /**
-     * Cancels the recovery and interrupts all eligible threads.
+     * Cancels the replication and interrupts all eligible threads.
      */
     public void cancel(String reason) {
         writer.cancel();