@java.lang.Override
    public boolean getIsSystemMessage() {
        return isSystemMessage_;
    }
<pre>
is_system_message can only be true if the user is an administrator,
or turms server will return an error
</pre>

<code>optional bool is_system_message = 2;</code>

@return The isSystemMessage.
turms-server-common/src/main/java/im/turms/server/common/access/client/dto/request/message/CreateMessageRequest.java