diff --git a/server/src/main/java/org/elasticsearch/index/IndexVersions.java b/server/src/main/java/org/elasticsearch/index/IndexVersions.java
index b82208a86c452..5f23ff16aa06b 100644
--- a/server/src/main/java/org/elasticsearch/index/IndexVersions.java
+++ b/server/src/main/java/org/elasticsearch/index/IndexVersions.java
@@ -188,6 +188,7 @@ private static Version parseUnchecked(String version) {
     public static final IndexVersion IGNORED_SOURCE_COALESCED_ENTRIES = def(9_039_0_00, Version.LUCENE_10_3_0);
     public static final IndexVersion BACKPORT_UPGRADE_TO_LUCENE_10_3_1 = def(9_039_0_01, Version.LUCENE_10_3_1);
     public static final IndexVersion BACKPORT_UPGRADE_TO_LUCENE_10_3_2 = def(9_039_0_02, Version.LUCENE_10_3_2);
+    public static final IndexVersion BACKPORT_SECURITY_MIGRATIONS_METADATA_FLATTENED_UPDATE = def(9_039_0_03, Version.LUCENE_10_3_2);
     public static final IndexVersion KEYWORD_MULTI_FIELDS_NOT_STORED_WHEN_IGNORED = def(9_040_0_00, Version.LUCENE_10_3_0);
     public static final IndexVersion UPGRADE_TO_LUCENE_10_3_1 = def(9_041_0_00, Version.LUCENE_10_3_1);
     public static final IndexVersion REENABLED_TIMESTAMP_DOC_VALUES_SPARSE_INDEX = def(9_042_0_00, Version.LUCENE_10_3_1);