Adjust deprecate index versions (#117523)

Adjust the deprecation index check to support the backport version in 8.x.

Relates #117183

Author: dnhatn

server/src/main/java/org/elasticsearch/index/IndexVersions.java

@@ -131,6 +131,7 @@ private static Version parseUnchecked(String version) {
     public static final IndexVersion ADD_ROLE_MAPPING_CLEANUP_MIGRATION = def(8_518_00_0, Version.LUCENE_9_12_0);
     public static final IndexVersion LOGSDB_DEFAULT_IGNORE_DYNAMIC_BEYOND_LIMIT_BACKPORT = def(8_519_00_0, Version.LUCENE_9_12_0);
     public static final IndexVersion TIME_BASED_K_ORDERED_DOC_ID_BACKPORT = def(8_520_00_0, Version.LUCENE_9_12_0);
+    public static final IndexVersion V8_DEPRECATE_SOURCE_MODE_MAPPER = def(8_521_00_0, Version.LUCENE_9_12_0);
     public static final IndexVersion UPGRADE_TO_LUCENE_10_0_0 = def(9_000_00_0, Version.LUCENE_10_0_0);
     public static final IndexVersion LOGSDB_DEFAULT_IGNORE_DYNAMIC_BEYOND_LIMIT = def(9_001_00_0, Version.LUCENE_10_0_0);
     public static final IndexVersion TIME_BASED_K_ORDERED_DOC_ID = def(9_002_00_0, Version.LUCENE_10_0_0);

server/src/main/java/org/elasticsearch/index/mapper/SourceFieldMapper.java

@@ -484,8 +484,7 @@ public boolean isStored() {
     }
 
     public static boolean onOrAfterDeprecateModeVersion(IndexVersion version) {
-        return version.onOrAfter(IndexVersions.DEPRECATE_SOURCE_MODE_MAPPER);
-        // Adjust versions after backporting.
-        // || version.between(IndexVersions.BACKPORT_DEPRECATE_SOURCE_MODE_MAPPER, IndexVersions.UPGRADE_TO_LUCENE_10_0_0);
+        return version.onOrAfter(IndexVersions.DEPRECATE_SOURCE_MODE_MAPPER)
+            || version.between(IndexVersions.V8_DEPRECATE_SOURCE_MODE_MAPPER, IndexVersions.UPGRADE_TO_LUCENE_10_0_0);
     }
 }