您必须通过运行以下命令来检查无服务器引擎是否支持特定的属性修改：

aws rds describe-db-cluster-parameters --db-cluster-parameter-group-name <param-group-name>

如果您阅读上述语句的输出，它会显示SupportedEngineModes的“预配”：

{
            "ParameterName": "binlog_format",
            "ParameterValue": "OFF",
            "Description": "Binary logging format for replication",
            "Source": "system",
            "ApplyType": "static",
            "DataType": "string",
            "AllowedValues": "ROW,STATEMENT,MIXED,OFF",
            "IsModifiable": true,
            "ApplyMethod": "pending-reboot",
            "SupportedEngineModes": [
                "provisioned"
            ]
        }

对于一个可修改的参数，理想状态如下：

{
            "ParameterName": "character_set_server",
            "Description": "The server's default character set.",
            "Source": "engine-default",
            "ApplyType": "dynamic",
            "DataType": "string",
            "AllowedValues": "big5,dec8,cp850,hp8,koi8r,latin1,latin2,swe7,ascii,ujis,sjis,hebrew,tis620,euckr,koi8u,gb2312,greek,cp1250,gbk,latin5,armscii8,utf8,ucs2,cp866,keybcs2,macce,macroman,cp852,latin7,utf8mb4,cp1251,utf16,cp1256,cp1257,utf32,binary,geostd8,cp932,eucjpms",
            "IsModifiable": true,
            "ApplyMethod": "pending-reboot",
            "SupportedEngineModes": [
                "provisioned",
                "serverless"
            ]
        },

Aurora现在确实支持启动和停止API，所以我很惊讶你不能使用它。
https://aws.amazon.com/about-aws/whats-new/2018/09/amazon-aurora-stop-and-start/
您可以尝试通过CLI使用它们吗？
另请注意，如果您只想重新启动引擎以使参数更改生效，则只需使用reboot-db-instance API。
https://docs.aws.amazon.com/cli/latest/reference/rds/reboot-db-instance.html