private int resolveMaxDistributorDocOperationSizeConfig(Integer flagValue) throws Exception {
        return resolveDistributorConfig((props) -> {
            if (flagValue != null) {
                props.setMaxDistributorDocumentOperationSizeMib(flagValue);
            }
        }).max_document_operation_message_size_bytes();
    }
Here there is no good choice.
config-model/src/test/java/com/yahoo/vespa/model/content/ContentClusterTest.java