Merge offset encoding index versions (elastic#125610)

Since we haven't yet had an 8.x release, there's no need for separate index
versions for the individual offset encoding implementations on the
8.x branch.

Author: jordan-powers

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

@@ -125,8 +125,7 @@ private static IndexVersion def(int id, Version luceneVersion) {
     public static final IndexVersion INFERENCE_METADATA_FIELDS_BACKPORT = def(8_524_0_00, Version.LUCENE_9_12_1);
     public static final IndexVersion LOGSB_OPTIONAL_SORTING_ON_HOST_NAME_BACKPORT = def(8_525_0_00, Version.LUCENE_9_12_1);
     public static final IndexVersion USE_SYNTHETIC_SOURCE_FOR_RECOVERY_BY_DEFAULT_BACKPORT = def(8_526_0_00, Version.LUCENE_9_12_1);
-    public static final IndexVersion SYNTHETIC_SOURCE_STORE_ARRAYS_NATIVELY_KEYWORD = def(8_527_0_00, Version.LUCENE_9_12_1);
-    public static final IndexVersion SYNTHETIC_SOURCE_STORE_ARRAYS_NATIVELY_NUMBER = def(8_528_0_00, Version.LUCENE_9_12_1);
+    public static final IndexVersion SYNTHETIC_SOURCE_STORE_ARRAYS_NATIVELY = def(8_527_0_00, Version.LUCENE_9_12_1);
     /*
      * STOP! READ THIS FIRST! No, really,
      *        ____ _____ ___  ____  _        ____  _____    _    ____    _____ _   _ ___ ____    _____ ___ ____  ____ _____ _

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

@@ -201,7 +201,7 @@ public IpFieldMapper build(MapperBuilderContext context) {
                 stored.getValue(),
                 this,
                 indexCreatedVersion,
-                IndexVersions.SYNTHETIC_SOURCE_STORE_ARRAYS_NATIVELY_KEYWORD
+                IndexVersions.SYNTHETIC_SOURCE_STORE_ARRAYS_NATIVELY
             );
             return new IpFieldMapper(
                 leafName(),

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

@@ -391,7 +391,7 @@ public KeywordFieldMapper build(MapperBuilderContext context) {
                 stored.getValue(),
                 this,
                 indexCreatedVersion,
-                IndexVersions.SYNTHETIC_SOURCE_STORE_ARRAYS_NATIVELY_KEYWORD
+                IndexVersions.SYNTHETIC_SOURCE_STORE_ARRAYS_NATIVELY
             );
             return new KeywordFieldMapper(
                 leafName(),

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

@@ -298,7 +298,7 @@ public NumberFieldMapper build(MapperBuilderContext context) {
                 stored.getValue(),
                 this,
                 indexCreatedVersion,
-                IndexVersions.SYNTHETIC_SOURCE_STORE_ARRAYS_NATIVELY_NUMBER
+                IndexVersions.SYNTHETIC_SOURCE_STORE_ARRAYS_NATIVELY
             );
             return new NumberFieldMapper(leafName(), ft, builderParams(this, context), context.isSourceSynthetic(), this, offsetsFieldName);
         }