backfill @required on imagebuilder#LaunchTemplateConfiguration.SetDef…

…aultVersion

.changelog/139b04a8d6124cb29dfb9e66f9f70386.json

@@ -0,0 +1,8 @@
+{
+    "id": "139b04a8-d612-4cb2-9dfb-9e66f9f70386",
+    "type": "bugfix",
+    "description": "**BREAKING CHANGE**: The value of LaunchTemplateConfiguration.SetDefaultVersion will now always be serialized in requests to the service, regardless of whether a value was set by the caller. Before this change, the value was not serialized if set to false. This behavior was broken because the service team had marked this value as being false by default, but did not actually do so, making it functionally impossible for users to set a false value for this field. **If you were not explicitly setting a value for this field before, the client will now send false by default.**",
+    "modules": [
+        "service/imagebuilder"
+    ]
+}

codegen/smithy-aws-go-codegen/src/main/java/software/amazon/smithy/aws/go/codegen/customization/BackfillRequiredTrait.java

@@ -23,7 +23,11 @@ public class BackfillRequiredTrait implements GoIntegration {
     private static final Map<ShapeId, Set<ShapeId>> toBackfill = Map.ofEntries(
             serviceToShapeIds("com.amazonaws.sqs#AmazonSQS",
                     // https://github.com/aws/aws-sdk/issues/527
-                    "com.amazonaws.sqs#ChangeMessageVisibilityBatchRequestEntry$VisibilityTimeout")
+                    "com.amazonaws.sqs#ChangeMessageVisibilityBatchRequestEntry$VisibilityTimeout"),
+            serviceToShapeIds("com.amazonaws.imagebuilder#imagebuilder",
+                    // https://github.com/aws/aws-sdk-go-v2/issues/2734
+                    // V1479153907
+                    "com.amazonaws.imagebuilder#LaunchTemplateConfiguration$setDefaultVersion")
     );
 
     private boolean mustPreprocess(ShapeId service) {
@@ -54,4 +58,4 @@ private static Map.Entry<ShapeId, Set<ShapeId>> serviceToShapeIds(String service
                 ShapeId.from(serviceId),
                 Arrays.stream(shapeIds).map(ShapeId::from).collect(toSet()));
     }
-}
+}