1 files changed, 1 insertions, 1 deletions
diff --git a/core/src/test/java/org/elasticsearch/action/admin/indices/flush/SyncedFlushUnitTests.java b/core/src/test/java/org/elasticsearch/action/admin/indices/flush/SyncedFlushUnitTests.java
index 8439e98f0e..18b22b95cb 100644
--- a/core/src/test/java/org/elasticsearch/action/admin/indices/flush/SyncedFlushUnitTests.java
+++ b/core/src/test/java/org/elasticsearch/action/admin/indices/flush/SyncedFlushUnitTests.java
@@ -148,7 +148,7 @@ public class SyncedFlushUnitTests extends ESTestCase {
             int failures = 0;
             List<ShardsSyncedFlushResult> shardsResults = new ArrayList<>();
             for (int shard = 0; shard < shards; shard++) {
-                final ShardId shardId = new ShardId(index, shard);
+                final ShardId shardId = new ShardId(index, "_na_", shard);
                 if (randomInt(5) < 2) {
                     // total shard failure
                     failed += replicas + 1;