Fix features

Author: thecoop

rest-api-spec/src/yamlRestTest/resources/rest-api-spec/test/search.vectors/41_knn_search_bbq_hnsw_bfloat16.yml

@@ -1,6 +1,6 @@
 setup:
   - requires:
-      cluster_features: "mapper.bbq_bfloat16"
+      cluster_features: "mapper.vectors.bbq_hnsw_on_disk_rescoring"
       reason: 'bfloat16 needs to be supported'
   - do:
       indices.create:

rest-api-spec/src/yamlRestTest/resources/rest-api-spec/test/search.vectors/42_knn_search_bbq_flat_bfloat16.yml

@@ -1,6 +1,6 @@
 setup:
   - requires:
-      cluster_features: "mapper.bbq_bfloat16"
+      cluster_features: "mapper.vectors.bbq_hnsw_on_disk_rescoring"
       reason: 'bfloat16 needs to be supported'
   - do:
       indices.create:

server/src/main/java/org/elasticsearch/script/field/vectors/BFloat16RankVectorsDocValuesField.java

@@ -138,7 +138,9 @@ public float[] next() {
             if (hasNext() == false) {
                 throw new IllegalArgumentException("No more elements in the iterator");
             }
-            BFloat16.bFloat16ToFloat(vectorValues, buffer);
+            for (int i = 0; i < buffer.length; i++) {
+                buffer[i] = BFloat16.bFloat16ToFloat(vectorValues.get());
+            }
             idx++;
             return buffer;
         }