gautamworah96 commented on a change in pull request #179:
URL: https://github.com/apache/lucene/pull/179#discussion_r698055359



##########
File path: 
lucene/facet/src/test/org/apache/lucene/facet/taxonomy/directory/TestBackwardsCompatibility.java
##########
@@ -89,6 +89,28 @@ private void createNewTaxonomyIndex(String dirName) throws 
IOException {
     dir.close();
   }
 
+  // Opens up a pre-existing index and tries to run getBulkPath on it
+  public void testGetBulkPathOnOlderCodec() throws Exception {
+    Path indexDir = createTempDir(oldTaxonomyIndexName);
+    TestUtil.unzip(getDataInputStream(oldTaxonomyIndexName + ".zip"), 
indexDir);
+    Directory dir = newFSDirectory(indexDir);
+
+    DirectoryTaxonomyWriter writer = new DirectoryTaxonomyWriter(dir);
+    DirectoryTaxonomyReader reader = new DirectoryTaxonomyReader(writer);
+
+    FacetLabel[] facetLabels = {
+      new FacetLabel("a"), new FacetLabel("b"),
+    };
+    int[] ordinals =
+        new int[] {reader.getOrdinal(facetLabels[0]), 
reader.getOrdinal(facetLabels[1])};
+    // The zip file already contains a category "a" and a category "b" stored 
with the older

Review comment:
       We have already added this condition in the `createNewTaxonomyIndex()` 
test (i.e the back compat test we had added for the BDV switch). See 
[here](https://github.com/apache/lucene/blob/56eb76dbaf7b2e9a4fbf7c1a25af2ba81ab1bc92/lucene/facet/src/test/org/apache/lucene/facet/taxonomy/directory/TestBackwardsCompatibility.java#L74)




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