zhaih commented on a change in pull request #630:
URL: https://github.com/apache/lucene/pull/630#discussion_r799744915



##########
File path: 
lucene/misc/src/java/org/apache/lucene/misc/index/IndexRearranger.java
##########
@@ -84,6 +112,28 @@ public void execute() throws Exception {
       }
       executor.shutdown();
     }
+    if (determinedOrder == false) {
+      return;
+    }
+    List<SegmentCommitInfo> ordered = new ArrayList<>();
+    try (IndexReader reader = DirectoryReader.open(output)) {
+      for (DocumentSelector ds : documentSelectors) {
+        boolean found = false;
+        for (LeafReaderContext context : reader.leaves()) {
+          SegmentReader sr = (SegmentReader) context.reader();
+          if (ds.getFilteredLiveDocs(sr).nextSetBit(0) != 
DocIdSetIterator.NO_MORE_DOCS) {
+            assert found == false;

Review comment:
       Makes sense, changed!




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