From a527b22ae76f21a4413569dea4e7271c190ece07 Mon Sep 17 00:00:00 2001
From: Jim Ferenczi <jim.ferenczi@elastic.co>
Date: Tue, 10 Jun 2025 08:01:18 +0100
Subject: [PATCH] Fix FetchSourceContext serialization for mixed-version
 clusters

Ensure the new exclude_vectors parameter is correctly serialized and deserialized when operating in a mixed-version cluster.
Given that version 8.19 is not compatible with 9.0, we can assume that all versions on or after 9.1 will support this new parameter.
---
 .../elasticsearch/search/fetch/subphase/FetchSourceContext.java | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/server/src/main/java/org/elasticsearch/search/fetch/subphase/FetchSourceContext.java b/server/src/main/java/org/elasticsearch/search/fetch/subphase/FetchSourceContext.java
index 943a698f756a2..3a87de8d5b2cf 100644
--- a/server/src/main/java/org/elasticsearch/search/fetch/subphase/FetchSourceContext.java
+++ b/server/src/main/java/org/elasticsearch/search/fetch/subphase/FetchSourceContext.java
@@ -97,7 +97,7 @@ public void writeTo(StreamOutput out) throws IOException {
     }
 
     private static boolean isVersionCompatibleWithExcludeVectors(TransportVersion version) {
-        return version.isPatchFrom(TransportVersions.SEARCH_SOURCE_EXCLUDE_VECTORS_PARAM_8_19);
+        return version.onOrAfter(TransportVersions.SEARCH_SOURCE_EXCLUDE_VECTORS_PARAM_8_19);
     }
 
     public boolean fetchSource() {