From e79894aa52fbc014071642581e32b6617d19e5cb Mon Sep 17 00:00:00 2001
From: Paul Sanwald <paul.sanwald@elastic.co>
Date: Thu, 10 May 2018 12:27:44 -0400
Subject: [PATCH] add version compatibility from 6.4.0 after backport, see
 #30319 (#30390)

---
 .../action/admin/indices/validate/query/QueryExplanation.java | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/server/src/main/java/org/elasticsearch/action/admin/indices/validate/query/QueryExplanation.java b/server/src/main/java/org/elasticsearch/action/admin/indices/validate/query/QueryExplanation.java
index 1438daf29fd15..780bf037f0e28 100644
--- a/server/src/main/java/org/elasticsearch/action/admin/indices/validate/query/QueryExplanation.java
+++ b/server/src/main/java/org/elasticsearch/action/admin/indices/validate/query/QueryExplanation.java
@@ -75,7 +75,7 @@ public String getExplanation() {
 
     @Override
     public void readFrom(StreamInput in) throws IOException {
-        if (in.getVersion().onOrAfter(Version.V_7_0_0_alpha1)) {
+        if (in.getVersion().onOrAfter(Version.V_6_4_0)) {
             index = in.readOptionalString();
         } else {
             index = in.readString();
@@ -92,7 +92,7 @@ public void readFrom(StreamInput in) throws IOException {
 
     @Override
     public void writeTo(StreamOutput out) throws IOException {
-        if (out.getVersion().onOrAfter(Version.V_7_0_0_alpha1)) {
+        if (out.getVersion().onOrAfter(Version.V_6_4_0)) {
             out.writeOptionalString(index);
         } else {
             out.writeString(index);