Rename the unit test class name

Signed-off-by: Tianli Feng <ftianli@amazon.com>

modules/reindex/src/test/java/org/opensearch/index/reindex/ReindexRenamingSettingTests.java → modules/reindex/src/test/java/org/opensearch/index/reindex/ReindexRenamedSettingTests.java

@@ -21,7 +21,7 @@
  * after it is deprecated, so that the backwards compatibility is maintained.
  * The test can be removed along with removing support of the deprecated setting.
  */
-public class ReindexRenamingSettingTests extends OpenSearchTestCase {
+public class ReindexRenamedSettingTests extends OpenSearchTestCase {
     ReindexPlugin plugin;
 
     @Before