Fix intermittent failure of TestDoubleValuesSourceRescorer (#14793)

Author: ChrisHegarty

lucene/core/src/test/org/apache/lucene/search/TestDoubleValuesSourceRescorer.java

@@ -78,7 +78,7 @@ private void publishDocs(int numDocs, String fieldName, boolean indexDocValues,
 
   public void testBasic() throws Exception {
     try (Directory dir = newDirectory()) {
-      publishDocs(random().nextInt(100), "title", true, dir);
+      publishDocs(random().nextInt(50, 100), "title", true, dir);
       try (IndexReader r = DirectoryReader.open(dir)) {
         IndexSearcher s = new IndexSearcher(r);
         TermQuery query =