public Builder required(Map<String, ActionResource> required) {
            clearRequired();
            this.required.get().putAll(required);
            return this;
        }
Gets the resources that will be authorized against based on
optional behavior of the IAM action.

@return the optional resources.
smithy-aws-iam-traits/src/main/java/software/amazon/smithy/aws/iam/traits/ActionResources.java