gf2121 commented on code in PR #12912:
URL: https://github.com/apache/lucene/pull/12912#discussion_r1422514730


##########
lucene/backward-codecs/src/test/org/apache/lucene/backward_index/TestBackwardsCompatibility.java:
##########
@@ -2265,4 +2268,47 @@ public void testReadNMinusTwoSegmentInfos() throws 
IOException {
       }
     }
   }
+
+  public static final String[] oldWikiTermsNames = {"wikiterms.9.8.0.zip"};
+
+  public void testCreateWikiTermsIndex() throws Exception {
+    Path indexDir = getIndexDir().resolve("wikiterms");
+    Files.deleteIfExists(indexDir);
+    Directory dir = newFSDirectory(indexDir);
+
+    IndexWriter writer = new IndexWriter(dir, new IndexWriterConfig());
+    BytesRefIterator termsEnum = 
TermsTestUtil.load(TermsTestUtil.WIKI_40000_TERMS_FILE);
+    BytesRef term;
+    while ((term = termsEnum.next()) != null) {
+      Document document = new Document();
+      document.add(new StringField("body", term, Field.Store.NO));
+      writer.addDocument(document);
+    }
+
+    writer.flush();
+    writer.commit();
+    writer.forceMerge(1);
+    writer.close();
+    dir.close();
+
+    // Gives you time to copy the index out!: (there is also
+    // a test option to not remove temp dir...):
+    Thread.sleep(100000);

Review Comment:
   I raised https://github.com/apache/lucene/pull/12914



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