From c042130b85bddf5cde6c88c002728c4ad21ddc42 Mon Sep 17 00:00:00 2001
From: Ignacio Vera <ignacio.vera@elastic.co>
Date: Wed, 6 Nov 2024 09:34:35 +0100
Subject: [PATCH] iter

---
 .../common/lucene/LuceneTests.java            | 22 +++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/server/src/test/java/org/elasticsearch/common/lucene/LuceneTests.java b/server/src/test/java/org/elasticsearch/common/lucene/LuceneTests.java
index 9300aa992b687..46be6f4c85dbe 100644
--- a/server/src/test/java/org/elasticsearch/common/lucene/LuceneTests.java
+++ b/server/src/test/java/org/elasticsearch/common/lucene/LuceneTests.java
@@ -50,7 +50,12 @@
 import org.apache.lucene.tests.store.MockDirectoryWrapper;
 import org.apache.lucene.util.Bits;
 import org.apache.lucene.util.BytesRef;
+import org.elasticsearch.TransportVersion;
+import org.elasticsearch.common.io.stream.BytesStreamOutput;
+import org.elasticsearch.common.io.stream.NamedWriteableAwareStreamInput;
 import org.elasticsearch.common.io.stream.NamedWriteableRegistry;
+import org.elasticsearch.common.io.stream.StreamInput;
+import org.elasticsearch.common.io.stream.Writeable;
 import org.elasticsearch.core.IOUtils;
 import org.elasticsearch.core.Tuple;
 import org.elasticsearch.index.fielddata.IndexFieldData;
@@ -571,6 +576,23 @@ public void testSortValueSerialization() throws IOException {
         assertEquals(sortValue, deserialized);
     }
 
+    private static <T> T copyInstance(
+        T original,
+        NamedWriteableRegistry namedWriteableRegistry,
+        Writeable.Writer<T> writer,
+        Writeable.Reader<T> reader,
+        TransportVersion version
+    ) throws IOException {
+        try (BytesStreamOutput output = new BytesStreamOutput()) {
+            output.setTransportVersion(version);
+            writer.write(output, original);
+            try (StreamInput in = new NamedWriteableAwareStreamInput(output.bytes().streamInput(), namedWriteableRegistry)) {
+                in.setTransportVersion(version);
+                return reader.read(in);
+            }
+        }
+    }
+
     public static Object randomSortValue() {
         return switch (randomIntBetween(0, 9)) {
             case 0 -> null;