[Test] Make sure that SearchAfterSortedDocQueryTests uses a single threaded searcher

core/src/test/java/org/apache/lucene/queries/SearchAfterSortedDocQueryTests.java

@@ -98,7 +98,7 @@ public class SearchAfterSortedDocQueryTests extends ESTestCase {
             }
         }
         final IndexReader reader = w.getReader();
-        final IndexSearcher searcher = newSearcher(reader);
+        final IndexSearcher searcher = new IndexSearcher(reader);
 
         int step = randomIntBetween(1, 10);
         FixedBitSet bitSet = new FixedBitSet(numDocs);