/usr/bin/copydatabase
/usr/bin/delve
/usr/bin/quest
/usr/bin/simpleexpand
/usr/bin/simpleindex
/usr/bin/simplesearch
/usr/bin/xapian-check
/usr/bin/xapian-chert-update
/usr/bin/xapian-compact
/usr/bin/xapian-config
/usr/bin/xapian-inspect
/usr/bin/xapian-metadata
/usr/bin/xapian-progsrv
/usr/bin/xapian-replicate
/usr/bin/xapian-replicate-server
/usr/bin/xapian-tcpsrv
You may install this package on CentOS with
yum
install xapian-core