The xinetd configuration file for amindexd is in amanda-2.4.2-1.i386.rpm but amindexd is in amanda-server-2.4.2-1.i386.rpm. Likewise, the xinetd configuration file for amidxtape is in amanda-server-2.4.2-1.i386.rpm and amidxtape is in amanda-2.4.2-1.i386.rpm.
Thanks. Fixed in amanda-2.4.2p1-1. Could you download them from http://people.redhat.com/teg/ and give them a try?