Change to an abstract class

Author: thecoop

server/src/main/java/org/elasticsearch/index/codec/vectors/DirectIOCapableFlatVectorsFormat.java

@@ -14,6 +14,10 @@
 
 import java.io.IOException;
 
-public interface DirectIOCapableFlatVectorsFormat {
-    FlatVectorsReader fieldsReader(SegmentReadState state, boolean useDirectIO) throws IOException;
+public abstract class DirectIOCapableFlatVectorsFormat extends AbstractFlatVectorsFormat {
+    protected DirectIOCapableFlatVectorsFormat(String name) {
+        super(name);
+    }
+
+    public abstract FlatVectorsReader fieldsReader(SegmentReadState state, boolean useDirectIO) throws IOException;
 }

server/src/main/java/org/elasticsearch/index/codec/vectors/es93/DirectIOCapableLucene99FlatVectorsFormat.java

@@ -28,7 +28,7 @@
 import java.io.IOException;
 import java.util.Set;
 
-public class DirectIOCapableLucene99FlatVectorsFormat extends AbstractFlatVectorsFormat implements DirectIOCapableFlatVectorsFormat {
+public class DirectIOCapableLucene99FlatVectorsFormat extends DirectIOCapableFlatVectorsFormat {
 
     static final String NAME = "Lucene99FlatVectorsFormat";
 

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

@@ -2044,8 +2044,7 @@ public BBQHnswIndexOptions(int m, int efConstruction, RescoreVector rescoreVecto
         @Override
         KnnVectorsFormat getVectorsFormat(ElementType elementType) {
             assert elementType == ElementType.FLOAT;
-            var format = new ES93HnswBinaryQuantizedVectorsFormat(m, efConstruction, onDiskRescore);
-            return format;
+            return new ES93HnswBinaryQuantizedVectorsFormat(m, efConstruction, onDiskRescore);
         }
 
         @Override