Longer timeout & more logging in testClusterHealthRestCancellation (#101911)

Relates #100062

qa/smoke-test-http/src/javaRestTest/java/org/elasticsearch/http/ClusterHealthRestCancellationIT.java

@@ -18,9 +18,11 @@ import org.elasticsearch.cluster.ClusterState;
 import org.elasticsearch.cluster.ClusterStateUpdateTask;
 import org.elasticsearch.cluster.service.ClusterService;
 import org.elasticsearch.common.Priority;
+import org.elasticsearch.test.junit.annotations.TestIssueLogging;
 
 import java.util.concurrent.CancellationException;
 import java.util.concurrent.CyclicBarrier;
+import java.util.concurrent.TimeUnit;
 
 import static org.elasticsearch.action.support.ActionTestUtils.wrapAsRestResponseListener;
 import static org.elasticsearch.test.TaskAssertions.assertAllCancellableTasksAreCancelled;
@@ -28,6 +30,10 @@ import static org.elasticsearch.test.TaskAssertions.awaitTaskWithPrefixOnMaster;
 
 public class ClusterHealthRestCancellationIT extends HttpSmokeTestCase {
 
+    @TestIssueLogging(
+        issueUrl = "https://github.com/elastic/elasticsearch/issues/100062",
+        value = "org.elasticsearch.test.TaskAssertions:TRACE"
+    )
     public void testClusterHealthRestCancellation() throws Exception {
 
         final var barrier = new CyclicBarrier(2);
@@ -37,7 +43,18 @@ public class ClusterHealthRestCancellationIT extends HttpSmokeTestCase {
                 @Override
                 public ClusterState execute(ClusterState currentState) {
                     safeAwait(barrier);
-                    safeAwait(barrier);
+                    // safeAwait(barrier);
+
+                    // temporarily lengthen timeout on safeAwait while investigating #100062
+                    try {
+                        barrier.await(60, TimeUnit.SECONDS);
+                    } catch (InterruptedException e) {
+                        Thread.currentThread().interrupt();
+                        throw new AssertionError("unexpected", e);
+                    } catch (Exception e) {
+                        throw new AssertionError("unexpected", e);
+                    }
+
                     return currentState;
                 }