This file is indexed.

/usr/share/dirsrv/updates/50memberofindex.ldif is in 389-ds-base 1.3.2.16-0ubuntu1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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dn: cn=memberOf,cn=default indexes, cn=config,cn=ldbm database,cn=plugins,cn=config
objectclass: top
objectclass: nsIndex
cn: memberOf
nssystemindex: false
nsindextype: eq