Use new formats

Author: thecoop

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

@@ -55,6 +55,7 @@
 import org.elasticsearch.index.codec.vectors.ES815HnswBitVectorsFormat;
 import org.elasticsearch.index.codec.vectors.diskbbq.ES920DiskBBQVectorsFormat;
 import org.elasticsearch.index.codec.vectors.es818.ES818BinaryQuantizedVectorsFormat;
+import org.elasticsearch.index.codec.vectors.es93.ES93BinaryQuantizedVectorsFormat;
 import org.elasticsearch.index.codec.vectors.es93.ES93HnswBinaryQuantizedVectorsFormat;
 import org.elasticsearch.index.fielddata.FieldDataContext;
 import org.elasticsearch.index.fielddata.IndexFieldData;
@@ -2075,6 +2076,7 @@ public BBQHnswIndexOptions(int m, int efConstruction, boolean onDiskRescore, Res
         KnnVectorsFormat getVectorsFormat(ElementType elementType) {
             return switch (elementType) {
                 case FLOAT -> new ES93HnswBinaryQuantizedVectorsFormat(m, efConstruction, onDiskRescore, false);
+                case BFLOAT16 -> new ES93HnswBinaryQuantizedVectorsFormat(m, efConstruction, onDiskRescore, true);
                 default -> throw new AssertionError();
             };
         }
@@ -2142,7 +2144,8 @@ static class BBQFlatIndexOptions extends QuantizedIndexOptions {
         @Override
         KnnVectorsFormat getVectorsFormat(ElementType elementType) {
             return switch (elementType) {
-                case FLOAT -> new ES818BinaryQuantizedVectorsFormat();
+                case FLOAT -> new ES93BinaryQuantizedVectorsFormat(false, false);
+                case BFLOAT16 -> new ES93BinaryQuantizedVectorsFormat(false, true);
                 default -> throw new AssertionError();
             };
         }
@@ -2207,13 +2210,21 @@ static class BBQIVFIndexOptions extends QuantizedIndexOptions {
 
         @Override
         KnnVectorsFormat getVectorsFormat(ElementType elementType) {
-            assert elementType == ElementType.FLOAT;
-            return new ES920DiskBBQVectorsFormat(
-                clusterSize,
-                ES920DiskBBQVectorsFormat.DEFAULT_CENTROIDS_PER_PARENT_CLUSTER,
-                onDiskRescore,
-                false
-            );
+            return switch (elementType) {
+                case FLOAT -> new ES920DiskBBQVectorsFormat(
+                    clusterSize,
+                    ES920DiskBBQVectorsFormat.DEFAULT_CENTROIDS_PER_PARENT_CLUSTER,
+                    onDiskRescore,
+                    false
+                );
+                case BFLOAT16 -> new ES920DiskBBQVectorsFormat(
+                    clusterSize,
+                    ES920DiskBBQVectorsFormat.DEFAULT_CENTROIDS_PER_PARENT_CLUSTER,
+                    onDiskRescore,
+                    true
+                );
+                default -> throw new AssertionError();
+            };
         }
 
         @Override