Fix testRejectionMessageAndShuttingDownFlag (#52280)

This test broke after merging #52280.

Author: ywelsch

server/src/main/java/org/elasticsearch/common/util/concurrent/TimedRunnable.java

@@ -105,4 +105,14 @@ public Runnable unwrap() {
         return original;
     }
 
+    @Override
+    public String toString() {
+        return "TimedRunnable{" +
+            "original=" + original +
+            ", creationTimeNanos=" + creationTimeNanos +
+            ", startTimeNanos=" + startTimeNanos +
+            ", finishTimeNanos=" + finishTimeNanos +
+            ", failedOrRejected=" + failedOrRejected +
+            '}';
+    }
 }

server/src/test/java/org/elasticsearch/common/util/concurrent/EsExecutorsTests.java

@@ -33,6 +33,7 @@
 
 import static org.hamcrest.Matchers.anyOf;
 import static org.hamcrest.Matchers.containsString;
+import static org.hamcrest.Matchers.either;
 import static org.hamcrest.Matchers.equalTo;
 import static org.hamcrest.Matchers.hasToString;
 import static org.hamcrest.Matchers.lessThan;
@@ -279,8 +280,9 @@ public String toString() {
             } catch (EsRejectedExecutionException e) {
                 assertFalse("Thread pool registering as terminated when it isn't", e.isExecutorShutdown());
                 String message = e.getMessage();
-                assertThat(message, containsString("of dummy runnable"));
-                assertThat(message, containsString("on EsThreadPoolExecutor[name = " + getName()));
+                assertThat(message, containsString("dummy runnable"));
+                assertThat(message, either(containsString("on EsThreadPoolExecutor[name = " + getName()))
+                    .or(containsString("on EWMATrackingEsThreadPoolExecutor[name = " + getName())));
                 assertThat(message, containsString("queue capacity = " + queue));
                 assertThat(message, containsString("[Running"));
                 /*
@@ -319,8 +321,9 @@ public String toString() {
         } catch (EsRejectedExecutionException e) {
             assertTrue("Thread pool not registering as terminated when it is", e.isExecutorShutdown());
             String message = e.getMessage();
-            assertThat(message, containsString("of dummy runnable"));
-            assertThat(message, containsString("on EsThreadPoolExecutor[name = " + getName()));
+            assertThat(message, containsString("dummy runnable"));
+            assertThat(message, either(containsString("on EsThreadPoolExecutor[name = " + getName()))
+                .or(containsString("on EWMATrackingEsThreadPoolExecutor[name = " + getName())));
             assertThat(message, containsString("queue capacity = " + queue));
             assertThat(message, containsString("[Terminated"));
             assertThat(message, containsString("active threads = 0"));