MariaDB Enterprise Server 10.5.4-2 on CentOS-7 seems to lack the mcsadmin utility. I cannot find any reference to it been removed, replaced by another tool or renamed. The package even ships an alias to it:

[root@p2w3 ~]# grep mcsadmin /etc/profile.d/columnstoreAlias.sh
alias ma=mcsadmin

[root@p2w3 ~]# ma
bash: ma: command not found

[root@p2w3 ~]# mcsadmin
bash: mcsadmin: command not found

[root@p2w3 ~]# set | grep PATH
PATH=/usr/lib/jvm/jre-1.8.0/bin:/usr/lib/jvm/jre-1.8.0/bin:/sbin:/bin:/usr/sbin:/usr/bin

[root@p2w3 ~]# rpm -q MariaDB-columnstore-engine
MariaDB-columnstore-engine-10.5.4_2-1.el7.x86_64

Installation was done from the RPM tarball via "rm -f debuginfo; yum install ./*rpm"