Adding versions for bwc for #125599

server/src/main/java/org/elasticsearch/TransportVersions.java

@@ -168,6 +168,7 @@ static TransportVersion def(int id) {
     public static final TransportVersion ESQL_AGGREGATE_METRIC_DOUBLE_BLOCK_8_19 = def(8_841_0_24);
     public static final TransportVersion INTRODUCE_FAILURES_LIFECYCLE_BACKPORT_8_19 = def(8_841_0_25);
     public static final TransportVersion INTRODUCE_FAILURES_DEFAULT_RETENTION_BACKPORT_8_19 = def(8_841_0_26);
+    public static final TransportVersion RESCORE_VECTOR_ALLOW_ZERO_BACKPORT_8_19 = def(8_841_0_27);
     public static final TransportVersion V_9_0_0 = def(9_000_0_09);
     public static final TransportVersion INITIAL_ELASTICSEARCH_9_0_1 = def(9_000_0_10);
     public static final TransportVersion COHERE_BIT_EMBEDDING_TYPE_SUPPORT_ADDED = def(9_001_0_00);

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

@@ -138,6 +138,7 @@ private static Version parseUnchecked(String version) {
     public static final IndexVersion USE_SYNTHETIC_SOURCE_FOR_RECOVERY_BY_DEFAULT_BACKPORT = def(8_526_0_00, parseUnchecked("9.12.1"));
     public static final IndexVersion SYNTHETIC_SOURCE_STORE_ARRAYS_NATIVELY_BACKPORT_8_X = def(8_527_0_00, Version.LUCENE_9_12_1);
     public static final IndexVersion ADD_RESCORE_PARAMS_TO_QUANTIZED_VECTORS_BACKPORT_8_X = def(8_528_0_00, Version.LUCENE_9_12_1);
+    public static final IndexVersion RESCORE_PARAMS_ALLOW_ZERO_TO_QUANTIZED_VECTORS_BACKPORT_8_X = def(8_529_0_00, Version.LUCENE_9_12_1);
     public static final IndexVersion UPGRADE_TO_LUCENE_10_0_0 = def(9_000_0_00, Version.LUCENE_10_0_0);
     public static final IndexVersion LOGSDB_DEFAULT_IGNORE_DYNAMIC_BEYOND_LIMIT = def(9_001_0_00, Version.LUCENE_10_0_0);
     public static final IndexVersion TIME_BASED_K_ORDERED_DOC_ID = def(9_002_0_00, Version.LUCENE_10_0_0);

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

@@ -96,6 +96,7 @@
 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.
@@ -114,14 +115,19 @@ private static boolean hasRescoreIndexVersion(IndexVersion version) {
             || version.between(IndexVersions.ADD_RESCORE_PARAMS_TO_QUANTIZED_VECTORS_BACKPORT_8_X, IndexVersions.UPGRADE_TO_LUCENE_10_0_0);
     }
 
+    private static boolean allowsZeroRescore(IndexVersion version) {
+        return version.onOrAfter(RESCORE_PARAMS_ALLOW_ZERO_TO_QUANTIZED_VECTORS)
+            || version.between(
+                IndexVersions.RESCORE_PARAMS_ALLOW_ZERO_TO_QUANTIZED_VECTORS_BACKPORT_8_X,
+                IndexVersions.UPGRADE_TO_LUCENE_10_0_0
+            );
+    }
+
     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 LITTLE_ENDIAN_FLOAT_STORED_INDEX_VERSION = IndexVersions.V_8_9_0;
-    public static final IndexVersion ADD_RESCORE_PARAMS_TO_QUANTIZED_VECTORS = IndexVersions.ADD_RESCORE_PARAMS_TO_QUANTIZED_VECTORS;
-    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");
@@ -2050,7 +2056,7 @@ static RescoreVector fromIndexOptions(Map<String, ?> indexOptionsMap, IndexVersi
                 throw new IllegalArgumentException("Invalid rescore_vector value. Missing required field " + OVERSAMPLE);
             }
             float oversampleValue = (float) XContentMapValues.nodeDoubleValue(oversampleNode);
-            if (oversampleValue == 0 && indexVersion.before(RESCORE_PARAMS_ALLOW_ZERO_TO_QUANTIZED_VECTORS)) {
+            if (oversampleValue == 0 && allowsZeroRescore(indexVersion) == false) {
                 throw new IllegalArgumentException("oversample must be greater than 1");
             }
             if (oversampleValue < 1 && oversampleValue != 0) {

server/src/main/java/org/elasticsearch/search/vectors/RescoreVectorBuilder.java

@@ -24,6 +24,7 @@
 import java.util.Objects;
 
 import static org.elasticsearch.TransportVersions.RESCORE_VECTOR_ALLOW_ZERO;
+import static org.elasticsearch.TransportVersions.RESCORE_VECTOR_ALLOW_ZERO_BACKPORT_8_19;
 
 public class RescoreVectorBuilder implements Writeable, ToXContentObject {
 
@@ -57,7 +58,9 @@ public RescoreVectorBuilder(StreamInput in) throws IOException {
     @Override
     public void writeTo(StreamOutput out) throws IOException {
         // We don't want to serialize a `0` oversample to a node that doesn't know what to do with it.
-        if (oversample == NO_OVERSAMPLE && out.getTransportVersion().before(RESCORE_VECTOR_ALLOW_ZERO)) {
+        if (oversample == NO_OVERSAMPLE
+            && out.getTransportVersion().before(RESCORE_VECTOR_ALLOW_ZERO)
+            && out.getTransportVersion().isPatchFrom(RESCORE_VECTOR_ALLOW_ZERO_BACKPORT_8_19) == false) {
             throw new ElasticsearchStatusException(
                 "[rescore_vector] does not support a 0 for ["
                     + OVERSAMPLE_FIELD.getPreferredName()

server/src/test/java/org/elasticsearch/index/mapper/vectors/DenseVectorFieldMapperTests.java

@@ -932,10 +932,17 @@ public void testRescoreVectorOldIndexVersion() {
     }
 
     public void testRescoreZeroVectorOldIndexVersion() {
-        IndexVersion incompatibleVersion = IndexVersionUtils.randomVersionBetween(
-            random(),
-            IndexVersionUtils.getLowestReadCompatibleVersion(),
-            IndexVersionUtils.getPreviousVersion(DenseVectorFieldMapper.RESCORE_PARAMS_ALLOW_ZERO_TO_QUANTIZED_VECTORS)
+        IndexVersion incompatibleVersion = randomFrom(
+            IndexVersionUtils.randomVersionBetween(
+                random(),
+                IndexVersionUtils.getLowestReadCompatibleVersion(),
+                IndexVersionUtils.getPreviousVersion(IndexVersions.RESCORE_PARAMS_ALLOW_ZERO_TO_QUANTIZED_VECTORS_BACKPORT_8_X)
+            ),
+            IndexVersionUtils.randomVersionBetween(
+                random(),
+                IndexVersions.UPGRADE_TO_LUCENE_10_0_0,
+                IndexVersionUtils.getPreviousVersion(IndexVersions.RESCORE_PARAMS_ALLOW_ZERO_TO_QUANTIZED_VECTORS)
+            )
         );
         for (String indexType : List.of("int8_hnsw", "int8_flat", "int4_hnsw", "int4_flat", "bbq_hnsw", "bbq_flat")) {
             expectThrows(