Working commit

Author: Samiul-TheSoccerFan

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

@@ -1462,6 +1462,9 @@ public IndexOptions parseIndexOptions(String fieldName, Map<String, ?> indexOpti
                 RescoreVector rescoreVector = null;
                 if (indexVersion.onOrAfter(ADD_RESCORE_PARAMS_TO_QUANTIZED_VECTORS)) {
                     rescoreVector = RescoreVector.fromIndexOptions(indexOptionsMap, indexVersion);
+                    if (rescoreVector == null) {
+                        rescoreVector = new RescoreVector(3.0f);
+                    }
                 }
                 MappingParser.checkNoRemainingFields(fieldName, indexOptionsMap);
                 return new BBQHnswIndexOptions(m, efConstruction, rescoreVector);