Fix test failures

Author: Kaival Parikh

lucene/core/src/java24/org/apache/lucene/internal/vectorization/Lucene99MemorySegmentScalarQuantizedVectorScorer.java

@@ -16,11 +16,13 @@
  */
 package org.apache.lucene.internal.vectorization;
 
-import static java.lang.foreign.ValueLayout.JAVA_FLOAT;
+import static java.lang.foreign.ValueLayout.JAVA_INT_UNALIGNED;
 import static org.apache.lucene.codecs.hnsw.ScalarQuantizedVectorScorer.quantizeQuery;
 
 import java.io.IOException;
 import java.lang.foreign.MemorySegment;
+import java.lang.foreign.ValueLayout;
+import java.nio.ByteOrder;
 import org.apache.lucene.codecs.hnsw.DefaultFlatVectorScorer;
 import org.apache.lucene.codecs.hnsw.FlatVectorsScorer;
 import org.apache.lucene.codecs.lucene99.Lucene99ScalarQuantizedVectorScorer;
@@ -145,6 +147,9 @@ ScalarQuantizer getQuantizer() {
       return quantizer;
     }
 
+    private static final ValueLayout.OfInt INT_UNALIGNED_LE =
+        JAVA_INT_UNALIGNED.withOrder(ByteOrder.LITTLE_ENDIAN);
+
     @SuppressWarnings("restricted")
     Node getNode(int ord) throws IOException {
       checkOrdinal(ord);
@@ -157,7 +162,9 @@ Node getNode(int ord) throws IOException {
         input.readBytes(byteOffset, scratch, 0, nodeSize);
         node = MemorySegment.ofArray(scratch);
       }
-      return new Node(node.reinterpret(vectorByteSize), node.get(JAVA_FLOAT, vectorByteSize));
+      return new Node(
+          node.reinterpret(vectorByteSize),
+          Float.intBitsToFloat(node.get(INT_UNALIGNED_LE, vectorByteSize)));
     }
 
     float scoreBody(int ord, float queryOffset) throws IOException {

lucene/core/src/test/org/apache/lucene/codecs/lucene99/TestLucene99HnswQuantizedVectorsFormat.java

@@ -306,7 +306,7 @@ public KnnVectorsFormat knnVectorsFormat() {
         "Lucene99HnswScalarQuantizedVectorsFormat(name=Lucene99HnswScalarQuantizedVectorsFormat, maxConn=10, beamWidth=20, flatVectorFormat=Lucene99ScalarQuantizedVectorsFormat(name=Lucene99ScalarQuantizedVectorsFormat, confidenceInterval=0.9, bits=4, compress=false, flatVectorScorer=ScalarQuantizedVectorScorer(nonQuantizedDelegate=DefaultFlatVectorScorer()), rawVectorFormat=Lucene99FlatVectorsFormat(vectorsScorer=%s())))";
     var defaultScorer = format(Locale.ROOT, expectedPattern, "DefaultFlatVectorScorer");
     var memSegScorer =
-        format(Locale.ROOT, expectedPattern, "Lucene99MemorySegmentFlatVectorsScorer");
+        format(Locale.ROOT, expectedPattern, "Lucene99MemorySegmentScalarQuantizedVectorScorer");
     assertThat(customCodec.knnVectorsFormat().toString(), is(oneOf(defaultScorer, memSegScorer)));
   }
 

lucene/core/src/test/org/apache/lucene/codecs/lucene99/TestLucene99ScalarQuantizedVectorsFormat.java

@@ -375,7 +375,7 @@ public KnnVectorsFormat knnVectorsFormat() {
         "Lucene99ScalarQuantizedVectorsFormat(name=Lucene99ScalarQuantizedVectorsFormat, confidenceInterval=0.9, bits=4, compress=false, flatVectorScorer=ScalarQuantizedVectorScorer(nonQuantizedDelegate=DefaultFlatVectorScorer()), rawVectorFormat=Lucene99FlatVectorsFormat(vectorsScorer=%s()))";
     var defaultScorer = format(Locale.ROOT, expectedPattern, "DefaultFlatVectorScorer");
     var memSegScorer =
-        format(Locale.ROOT, expectedPattern, "Lucene99MemorySegmentFlatVectorsScorer");
+        format(Locale.ROOT, expectedPattern, "Lucene99MemorySegmentScalarQuantizedVectorScorer");
     assertThat(customCodec.knnVectorsFormat().toString(), is(oneOf(defaultScorer, memSegScorer)));
   }