Do not restore locale to the unusable one

Author: jkakavas

test/framework/src/main/java/org/elasticsearch/test/ESTestCase.java

@@ -193,8 +193,6 @@ public abstract class ESTestCase extends LuceneTestCase {
 
     private static final Collection<String> nettyLoggedLeaks = new ArrayList<>();
 
-    private static Locale restoreLocale;
-
     @AfterClass
     public static void resetPortCounter() {
         portGenerator.set(0);
@@ -335,19 +333,10 @@ public static void ensureSupportedLocale() {
             Logger logger = LogManager.getLogger(ESTestCase.class);
             logger.warn("Attempting to run tests in an unusable locale in a FIPS JVM. Certificate expiration validation will fail, " +
                 "switching to English. See: https://github.com/bcgit/bc-java/issues/405");
-            restoreLocale = Locale.getDefault();
             Locale.setDefault(Locale.ENGLISH);
         }
     }
 
-    @AfterClass
-    public static void restoreLocale() {
-        if (restoreLocale != null) {
-            Locale.setDefault(restoreLocale);
-            restoreLocale = null;
-        }
-    }
-
     @Before
     public final void before()  {
         logger.info("{}before test", getTestParamsForLogging());