remove unused code

Author: Samiul-TheSoccerFan

x-pack/plugin/inference/src/main/java/org/elasticsearch/xpack/inference/queries/SemanticKnnVectorQueryRewriteInterceptor.java

@@ -148,14 +148,6 @@ private TextEmbeddingQueryVectorBuilder getTextEmbeddingQueryBuilderFromQuery(Kn
         return (TextEmbeddingQueryVectorBuilder) queryVectorBuilder;
     }
 
-    private KnnVectorQueryBuilder buildNewKnnVectorQuery(
-        String fieldName,
-        KnnVectorQueryBuilder original,
-        QueryVectorBuilder queryVectorBuilder
-    ) {
-        return new KnnVectorQueryBuilder(original, fieldName, queryVectorBuilder);
-    }
-
     @Override
     public String getQueryName() {
         return KnnVectorQueryBuilder.NAME;