From c9749180a1a966091949db155cbb4e1396972525 Mon Sep 17 00:00:00 2001
From: Nhat Nguyen <nhat.nguyen@elastic.co>
Date: Sat, 17 Mar 2018 11:38:22 -0400
Subject: [PATCH] Backport - Do not renew sync-id PR to 5.6 and 6.3

Relates ##29103
---
 .../org/elasticsearch/indices/flush/SyncedFlushService.java | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/server/src/main/java/org/elasticsearch/indices/flush/SyncedFlushService.java b/server/src/main/java/org/elasticsearch/indices/flush/SyncedFlushService.java
index dedd577954d..65bacd94910 100644
--- a/server/src/main/java/org/elasticsearch/indices/flush/SyncedFlushService.java
+++ b/server/src/main/java/org/elasticsearch/indices/flush/SyncedFlushService.java
@@ -569,7 +569,11 @@ public class SyncedFlushService extends AbstractComponent implements IndexEventL
         }
 
         boolean includeExistingSyncId(Version version) {
-            return version.onOrAfter(Version.V_7_0_0_alpha1);
+            if (version.major == Version.V_5_6_9.major) {
+                return version.onOrAfter(Version.V_5_6_9);
+            } else {
+                return version.onOrAfter(Version.V_6_3_0);
+            }
         }
 
         @Override