From 2ff42357a4f62ca21809fed6eae262da8b72f00b Mon Sep 17 00:00:00 2001
From: "github-actions[bot]" <github-actions[bot]@users.noreply.github.com>
Date: Thu, 30 Nov 2023 07:38:23 +0000
Subject: [PATCH] Add log for unreferenced file cleanup (#11380)

Signed-off-by: RS146BIJAY <rishavsagar4b1@gmail.com>
(cherry picked from commit 4f7b2a429128e856bf7e8943b1e4345f6a98b225)
Signed-off-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>
---
 server/src/main/java/org/opensearch/index/engine/Engine.java | 1 +
 1 file changed, 1 insertion(+)

diff --git a/server/src/main/java/org/opensearch/index/engine/Engine.java b/server/src/main/java/org/opensearch/index/engine/Engine.java
index d106ac167c600..66e7b30ab0b4d 100644
--- a/server/src/main/java/org/opensearch/index/engine/Engine.java
+++ b/server/src/main/java/org/opensearch/index/engine/Engine.java
@@ -1373,6 +1373,7 @@ public void failEngine(String reason, @Nullable Exception failure) {
                     // clean all unreferenced files on best effort basis created during failed merge and reset the
                     // shard state back to last Lucene Commit.
                     if (shouldCleanupUnreferencedFiles() && isMergeFailureDueToIOException(failure, reason)) {
+                        logger.info("Cleaning up unreferenced files as merge failed due to: {}", reason);
                         cleanUpUnreferencedFiles();
                     }