Remove HnswBuilder interface

Author: carlosdelest

server/src/main/java/org/elasticsearch/index/codec/vectors/es910/hnsw/HnswBuilder.java

@@ -49,7 +49,7 @@
  * Builder for HNSW graph. See {@link HnswGraph} for a gloss on the algorithm and the meaning of the
  * hyper-parameters.
  */
-public class HnswGraphBuilder implements HnswBuilder {
+public class HnswGraphBuilder {
 
     /** Default number of maximum connections per node */
     public static final int DEFAULT_MAX_CONN = 16;
@@ -160,7 +160,6 @@ protected HnswGraphBuilder(
         beamCandidates0 = new GraphBuilderKnnCollector(Math.min(beamWidth / 2, M * 3));
     }
 
-    @Override
     public OnHeapHnswGraph build(int maxOrd) throws IOException {
         if (frozen) {
             throw new IllegalStateException("This HnswGraphBuilder is frozen and cannot be updated");
@@ -172,20 +171,17 @@ public OnHeapHnswGraph build(int maxOrd) throws IOException {
         return getCompletedGraph();
     }
 
-    @Override
     public void setInfoStream(InfoStream infoStream) {
         this.infoStream = infoStream;
     }
 
-    @Override
     public OnHeapHnswGraph getCompletedGraph() throws IOException {
         if (frozen == false) {
             finish();
         }
         return getGraph();
     }
 
-    @Override
     public OnHeapHnswGraph getGraph() {
         return hnsw;
     }
@@ -294,7 +290,6 @@ private void addGraphNodeInternal(int node, UpdateableRandomVectorScorer scorer,
         } while (true);
     }
 
-    @Override
     public void addGraphNode(int node) throws IOException {
         /*
         Note: this implementation is thread safe when graph size is fixed (e.g. when merging)

server/src/main/java/org/elasticsearch/index/codec/vectors/es910/hnsw/HnswGraphBuilder.java

@@ -110,7 +110,7 @@ public IncrementalHnswGraphMerger addReader(KnnVectorsReader reader, MergeState.
      * @return HnswGraphBuilder
      * @throws IOException If an error occurs while reading from the merge state
      */
-    protected HnswBuilder createBuilder(KnnVectorValues mergedVectorValues, int maxOrd) throws IOException {
+    protected HnswGraphBuilder createBuilder(KnnVectorValues mergedVectorValues, int maxOrd) throws IOException {
         if (graphReaders.size() == 0) {
             return HnswGraphBuilder.create(scorerSupplier, M, beamWidth, HnswGraphBuilder.randSeed, maxOrd);
         }
@@ -175,7 +175,7 @@ protected final int[][] getNewOrdMapping(KnnVectorValues mergedVectorValues, Bit
     }
 
     public OnHeapHnswGraph merge(KnnVectorValues mergedVectorValues, InfoStream infoStream, int maxOrd) throws IOException {
-        HnswBuilder builder = createBuilder(mergedVectorValues, maxOrd);
+        HnswGraphBuilder builder = createBuilder(mergedVectorValues, maxOrd);
         builder.setInfoStream(infoStream);
         return builder.build(maxOrd);
     }