Revert "spike: overload vectorIndex method to partially override the default vector config"

This reverts commit b721a52.

Author: bevzzz

src/main/java/io/weaviate/client6/v1/api/collections/VectorIndex.java

@@ -3,7 +3,6 @@
 import java.io.IOException;
 import java.util.EnumMap;
 import java.util.Map;
-import java.util.function.Function;
 
 import com.google.gson.Gson;
 import com.google.gson.JsonParser;
@@ -16,17 +15,11 @@
 
 import io.weaviate.client6.v1.api.collections.vectorindex.Flat;
 import io.weaviate.client6.v1.api.collections.vectorindex.Hnsw;
-import io.weaviate.client6.v1.internal.ObjectBuilder;
 import io.weaviate.client6.v1.internal.json.JsonEnum;
 
 public interface VectorIndex {
   static final String DEFAULT_VECTOR_NAME = "default";
   static final VectorIndex DEFAULT_VECTOR_INDEX = Hnsw.of();
-  static final Function<Function<Hnsw.Builder, ObjectBuilder<Hnsw>>, VectorIndex> DEFAULT_VECTOR_INDEX_FUNC = Hnsw::of;
-
-  static VectorIndex createDefault(Function<Hnsw.Builder, ObjectBuilder<Hnsw>> fn) {
-    return DEFAULT_VECTOR_INDEX_FUNC.apply(fn);
-  }
 
   public enum Kind implements JsonEnum<Kind> {
     HNSW("hnsw"),

src/main/java/io/weaviate/client6/v1/api/collections/vectorizers/Img2VecNeuralVectorizer.java

@@ -9,7 +9,6 @@
 
 import io.weaviate.client6.v1.api.collections.VectorIndex;
 import io.weaviate.client6.v1.api.collections.Vectorizer;
-import io.weaviate.client6.v1.api.collections.vectorindex.Hnsw;
 import io.weaviate.client6.v1.internal.ObjectBuilder;
 
 public record Img2VecNeuralVectorizer(
@@ -55,17 +54,6 @@ public Builder imageFields(String... fields) {
       return imageFields(Arrays.asList(fields));
     }
 
-    /**
-     * Override default vector index configuration.
-     *
-     * <a href=
-     * "https://docs.weaviate.io/weaviate/config-refs/indexing/vector-index#hnsw-index-parameters">HNSW</a>
-     * is the default vector index.
-     */
-    public Builder vectorIndex(Function<Hnsw.Builder, ObjectBuilder<Hnsw>> fn) {
-      return vectorIndex(VectorIndex.createDefault(fn));
-    }
-
     /**
      * Override default vector index configuration.
      *