test(pub-period-migration) fix "canSearchUsingMetadataDateUpdatedInde…

…x" test

src/test/java/org/folio/rest/api/InstanceStorageTest.java

@@ -823,7 +823,7 @@ public void canSearchUsingMetadataDateUpdatedIndex()
 
     JsonObject secondInstanceToCreate = nod(secondInstanceId);
 
-    IndividualResource ir = createInstance(secondInstanceToCreate);
+    IndividualResource ir = createInstanceWithDelay(secondInstanceToCreate);
 
     CompletableFuture<Response> getCompleted = new CompletableFuture<>();
 
@@ -3041,6 +3041,34 @@ private IndividualResource createInstance(JsonObject instanceToCreate)
     return new IndividualResource(response);
   }
 
+  private IndividualResource createInstanceWithDelay(JsonObject instanceToCreate)
+    throws InterruptedException, ExecutionException, TimeoutException {
+    // delay before creating the instance
+    CompletableFuture<Void> delayFuture = CompletableFuture.runAsync(() -> {
+      try {
+        TimeUnit.SECONDS.sleep(1);
+      } catch (InterruptedException e) {
+        Thread.currentThread().interrupt();
+      }
+    });
+    // create the instance
+    CompletableFuture<Response> createCompleted = delayFuture.thenCompose(v -> {
+      CompletableFuture<Response> responseFuture = new CompletableFuture<>();
+
+      getClient().post(instancesStorageUrl(""), instanceToCreate,
+        TENANT_ID, json(responseFuture));
+
+      return responseFuture;
+    });
+    // get the response
+    Response response = createCompleted.get(2, TimeUnit.SECONDS);
+
+    assertThat(format("Create instance failed: %s", response.getBody()),
+      response.getStatusCode(), is(201));
+
+    return new IndividualResource(response);
+  }
+
   private Response update(JsonObject instance) {
     final UUID id = UUID.fromString(instance.getString("id"));
     CompletableFuture<Response> replaceCompleted = new CompletableFuture<>();