private void ensureUserIdsIsMutable() {
            if (!userIds_.isModifiable()) {
                userIds_ = makeMutableCopy(userIds_);
            }
            bitField0_ |= 0x00000001;
        }
Protobuf type {@code im.turms.proto.QueryUserOnlineStatusesRequest}
turms-server-common/src/main/java/im/turms/server/common/access/client/dto/request/user/QueryUserOnlineStatusesRequest.java