/usr/share/dirsrv/updates/50entryusnindex.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.
1 2 3 4 5 6 7 | dn: cn=entryusn,cn=default indexes, cn=config,cn=ldbm database,cn=plugins,cn=config
objectclass: top
objectclass: nsIndex
cn: entryusn
nssystemindex: true
nsindextype: eq
nsmatchingrule: integerOrderingMatch
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