Adding backport index versions for PR elastic#127134 (elastic#127724)

This adds backport index versions in preparation for backporting
elastic#127134

Author: benwtrent

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

@@ -130,6 +130,7 @@ private static IndexVersion def(int id, Version luceneVersion) {
     public static final IndexVersion SYNTHETIC_SOURCE_STORE_ARRAYS_NATIVELY = def(8_527_0_00, Version.LUCENE_9_12_1);
     public static final IndexVersion ADD_RESCORE_PARAMS_TO_QUANTIZED_VECTORS = def(8_528_0_00, Version.LUCENE_9_12_1);
     public static final IndexVersion RESCORE_PARAMS_ALLOW_ZERO_TO_QUANTIZED_VECTORS = def(8_529_0_00, Version.LUCENE_9_12_1);
+    public static final IndexVersion DEFAULT_OVERSAMPLE_VALUE_FOR_BBQ_BACKPORT_8_X = def(8_530_0_00, Version.LUCENE_9_12_1);
     /*
      * STOP! READ THIS FIRST! No, really,
      *        ____ _____ ___  ____  _        ____  _____    _    ____    _____ _   _ ___ ____    _____ ___ ____  ____ _____ _

server/src/main/java/org/elasticsearch/index/mapper/vectors/DenseVectorFieldMapper.java

@@ -94,8 +94,6 @@
 
 import static org.elasticsearch.common.Strings.format;
 import static org.elasticsearch.common.xcontent.XContentParserUtils.ensureExpectedToken;
-import static org.elasticsearch.index.IndexVersions.DEFAULT_DENSE_VECTOR_TO_INT8_HNSW;
-import static org.elasticsearch.index.IndexVersions.RESCORE_PARAMS_ALLOW_ZERO_TO_QUANTIZED_VECTORS;
 
 /**
  * A {@link FieldMapper} for indexing a dense vector of floats.
@@ -118,17 +116,18 @@ private static boolean hasRescoreIndexVersion(IndexVersion version) {
     }
 
     private static boolean allowsZeroRescore(IndexVersion version) {
-        return version.onOrAfter(RESCORE_PARAMS_ALLOW_ZERO_TO_QUANTIZED_VECTORS);
+        return version.onOrAfter(IndexVersions.RESCORE_PARAMS_ALLOW_ZERO_TO_QUANTIZED_VECTORS);
+    }
+
+    private static boolean defaultOversampleForBBQ(IndexVersion version) {
+        return version.onOrAfter(IndexVersions.DEFAULT_OVERSAMPLE_VALUE_FOR_BBQ_BACKPORT_8_X);
     }
 
     public static final IndexVersion MAGNITUDE_STORED_INDEX_VERSION = IndexVersions.V_7_5_0;
     public static final IndexVersion INDEXED_BY_DEFAULT_INDEX_VERSION = IndexVersions.FIRST_DETACHED_INDEX_VERSION;
     public static final IndexVersion NORMALIZE_COSINE = IndexVersions.NORMALIZED_VECTOR_COSINE;
-    public static final IndexVersion DEFAULT_TO_INT8 = DEFAULT_DENSE_VECTOR_TO_INT8_HNSW;
+    public static final IndexVersion DEFAULT_TO_INT8 = IndexVersions.DEFAULT_DENSE_VECTOR_TO_INT8_HNSW;
     public static final IndexVersion LITTLE_ENDIAN_FLOAT_STORED_INDEX_VERSION = IndexVersions.V_8_9_0;
-    public static final IndexVersion RESCORE_PARAMS_ALLOW_ZERO_TO_QUANTIZED_VECTORS =
-        IndexVersions.RESCORE_PARAMS_ALLOW_ZERO_TO_QUANTIZED_VECTORS;
-    public static final IndexVersion DEFAULT_OVERSAMPLE_VALUE_FOR_BBQ = IndexVersions.DEFAULT_OVERSAMPLE_VALUE_FOR_BBQ;
 
     public static final NodeFeature RESCORE_VECTOR_QUANTIZED_VECTOR_MAPPING = new NodeFeature("mapper.dense_vector.rescore_vector");
     public static final NodeFeature RESCORE_ZERO_VECTOR_QUANTIZED_VECTOR_MAPPING = new NodeFeature(
@@ -201,7 +200,7 @@ public Builder(String name, IndexVersion indexVersionCreated) {
             super(name);
             this.indexVersionCreated = indexVersionCreated;
             final boolean indexedByDefault = indexVersionCreated.onOrAfter(INDEXED_BY_DEFAULT_INDEX_VERSION);
-            final boolean defaultInt8Hnsw = indexVersionCreated.onOrAfter(DEFAULT_DENSE_VECTOR_TO_INT8_HNSW);
+            final boolean defaultInt8Hnsw = indexVersionCreated.onOrAfter(IndexVersions.DEFAULT_DENSE_VECTOR_TO_INT8_HNSW);
             this.indexed = Parameter.indexParam(m -> toType(m).fieldType().indexed, indexedByDefault);
             if (indexedByDefault) {
                 // Only serialize on newer index versions to prevent breaking existing indices when upgrading
@@ -1444,7 +1443,7 @@ public IndexOptions parseIndexOptions(String fieldName, Map<String, ?> indexOpti
                 RescoreVector rescoreVector = null;
                 if (hasRescoreIndexVersion(indexVersion)) {
                     rescoreVector = RescoreVector.fromIndexOptions(indexOptionsMap, indexVersion);
-                    if (rescoreVector == null && indexVersion.onOrAfter(DEFAULT_OVERSAMPLE_VALUE_FOR_BBQ)) {
+                    if (rescoreVector == null && defaultOversampleForBBQ(indexVersion)) {
                         rescoreVector = new RescoreVector(DEFAULT_OVERSAMPLE);
                     }
                 }
@@ -1468,7 +1467,7 @@ public IndexOptions parseIndexOptions(String fieldName, Map<String, ?> indexOpti
                 RescoreVector rescoreVector = null;
                 if (hasRescoreIndexVersion(indexVersion)) {
                     rescoreVector = RescoreVector.fromIndexOptions(indexOptionsMap, indexVersion);
-                    if (rescoreVector == null && indexVersion.onOrAfter(DEFAULT_OVERSAMPLE_VALUE_FOR_BBQ)) {
+                    if (rescoreVector == null && defaultOversampleForBBQ(indexVersion)) {
                         rescoreVector = new RescoreVector(DEFAULT_OVERSAMPLE);
                     }
                 }