Cleanup: Remove obsolete TODO from SparseVectorQueryBuilder

x-pack/plugin/core/src/main/java/org/elasticsearch/xpack/core/ml/search/SparseVectorQueryBuilder.java

@@ -271,7 +271,7 @@ protected QueryBuilder doRewrite(QueryRewriteContext queryRewriteContext) {
             throw new IllegalArgumentException("inference_id required to perform vector search on query string");
         }
 
-        // TODO move this to xpack core and use inference APIs
+        // TODO(server): once search-time inference APIs exist in the server module, switch this to InferenceAction.Request
         CoordinatedInferenceAction.Request inferRequest = CoordinatedInferenceAction.Request.forTextInput(
             inferenceId,
             List.of(query),