Revert test change to IndexVersions

Author: ldematte

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

@@ -173,7 +173,6 @@ private static Version parseUnchecked(String version) {
     public static final IndexVersion SEQ_NO_WITHOUT_POINTS = def(9_027_0_00, Version.LUCENE_10_2_1);
     public static final IndexVersion INDEX_INT_SORT_INT_TYPE = def(9_028_0_00, Version.LUCENE_10_2_1);
     public static final IndexVersion MAPPER_TEXT_MATCH_ONLY_MULTI_FIELDS_DEFAULT_NOT_STORED = def(9_029_0_00, Version.LUCENE_10_2_1);
-    public static final IndexVersion TEST_INDEX_VERSION_DO_NOT_MERGE = def(9_030_0_00, Version.LUCENE_10_2_1);
 
     /*
      * STOP! READ THIS FIRST! No, really,