From d69d421b39bbad6abaa35a0243f324b002faabf2 Mon Sep 17 00:00:00 2001
From: "github-actions[bot]"
 <41898282+github-actions[bot]@users.noreply.github.com>
Date: Thu, 18 Apr 2024 13:38:49 +0200
Subject: [PATCH] Fix union serialization (#8146) (#8148)

Co-authored-by: Florian Bernd <git@flobernd.de>
---
 .../Serialization/UnionConverter.cs           | 30 +++++++++----------
 1 file changed, 14 insertions(+), 16 deletions(-)

diff --git a/src/Elastic.Clients.Elasticsearch.Shared/Serialization/UnionConverter.cs b/src/Elastic.Clients.Elasticsearch.Shared/Serialization/UnionConverter.cs
index c3e2e8f14e3..779d37be2c9 100644
--- a/src/Elastic.Clients.Elasticsearch.Shared/Serialization/UnionConverter.cs
+++ b/src/Elastic.Clients.Elasticsearch.Shared/Serialization/UnionConverter.cs
@@ -130,16 +130,15 @@ private class DerivedUnionConverterInner<TType, TItem1, TItem2> : JsonConverter<
 		public override void Write(Utf8JsonWriter writer, TType value,
 			JsonSerializerOptions options)
 		{
-			if (value.Item1 is not null)
+			switch (value.Tag)
 			{
-				JsonSerializer.Serialize(writer, value.Item1, value.Item1.GetType(), options);
-				return;
-			}
+				case 0:
+					JsonSerializer.Serialize(writer, value.Item1, value.Item1!.GetType(), options);
+					return;
 
-			if (value.Item2 is not null)
-			{
-				JsonSerializer.Serialize(writer, value.Item2, value.Item2.GetType(), options);
-				return;
+				case 1:
+					JsonSerializer.Serialize(writer, value.Item2, value.Item2!.GetType(), options);
+					return;
 			}
 
 			throw new JsonException("Invalid union type.");
@@ -196,16 +195,15 @@ private class UnionConverterInner<TItem1, TItem2> : JsonConverter<Union<TItem1,
 		public override void Write(Utf8JsonWriter writer, Union<TItem1, TItem2> value,
 			JsonSerializerOptions options)
 		{
-			if (value.Item1 is not null)
+			switch (value.Tag)
 			{
-				JsonSerializer.Serialize(writer, value.Item1, value.Item1.GetType(), options);
-				return;
-			}
+				case 0:
+					JsonSerializer.Serialize(writer, value.Item1, value.Item1!.GetType(), options);
+					return;
 
-			if (value.Item2 is not null)
-			{
-				JsonSerializer.Serialize(writer, value.Item2, value.Item2.GetType(), options);
-				return;
+				case 1:
+					JsonSerializer.Serialize(writer, value.Item2, value.Item2!.GetType(), options);
+					return;
 			}
 
 			throw new JsonException("Invalid union type");