javanna commented on code in PR #12523:
URL: https://github.com/apache/lucene/pull/12523#discussion_r1343749320


##########
lucene/core/src/test/org/apache/lucene/search/TestIndexSearcher.java:
##########
@@ -267,7 +266,133 @@ protected LeafSlice[] slices(List<LeafReaderContext> 
leaves) {
             return slices.toArray(new LeafSlice[0]);
           }
         };
-    searcher.search(new MatchAllDocsQuery(), 10);
-    assertEquals(leaves.size(), numExecutions.get());
+    TopDocs topDocs = searcher.search(new MatchAllDocsQuery(), 10);
+    assertTrue(topDocs.totalHits.value > 0);
+    if (leaves.size() <= 1) {
+      assertEquals(0, numExecutions.get());
+    } else {
+      assertEquals(leaves.size(), numExecutions.get());
+    }

Review Comment:
   I am still not getting what has changed that makes the additional if 
required in this test. I thought that we offload to the executor even with a 
single segment, hence `assertEquals(leaves.size(), numExecutions.get());` 
should be comprehensive, even for when there are no segments. Have you run 
multiple iterations with this change? Was the test failing for you that made 
you change it?



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