jpountz commented on code in PR #13067:
URL: https://github.com/apache/lucene/pull/13067#discussion_r1487442233


##########
lucene/backward-codecs/src/test/org/apache/lucene/backward_index/TestIndexSortBackwardsCompatibility.java:
##########
@@ -82,14 +84,20 @@ public void testSortedIndexAddDocBlocks() throws Exception {
             .setOpenMode(IndexWriterConfig.OpenMode.APPEND)
             .setIndexSort(sort)
             .setMergePolicy(newLogMergePolicy());
+    if (this.version.onOrAfter(FIRST_PARENT_DOC_VERSION)) {
+      indexWriterConfig.setParentField(PARENT_FIELD_NAME);
+    }
     // open writer
     try (IndexWriter writer = new IndexWriter(directory, indexWriterConfig)) {
       // add 10 docs
       for (int i = 0; i < 10; i++) {
         Document child = new Document();
         child.add(new StringField("relation", "child", Field.Store.NO));
         child.add(new StringField("bid", "" + i, Field.Store.NO));
-        child.add(new NumericDocValuesField("dateDV", i));
+        if (version.onOrAfter(FIRST_PARENT_DOC_VERSION)
+            == false) { // only add this to earlier versions
+          child.add(new NumericDocValuesField("dateDV", i));
+        }

Review Comment:
   Ah thanks, that makes sense. I had read the condition under the if statement 
backwards.



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