This file is indexed.

/usr/share/bash-completion/completions/cryptdisks is in cryptsetup 2:2.0.2-1ubuntu1.

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

The actual contents of the file can be viewed below.

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# cryptdisks_{start,stop} completion by first row of crypttab
#
# Copyright 2013 Claudius Hubig <cl_crds@chubig.net>, 2-clause BSD

_cryptdisks() {
    local tf;
    tf=${TABFILE-"/etc/crypttab"};
    COMPREPLY=($(egrep -v "^[[:space:]]*(#|$)" "${tf}" | egrep -o "^${COMP_WORDS[COMP_CWORD]}[^[:space:]]*"));
    return 0;
}

complete -F _cryptdisks cryptdisks_start;
complete -F _cryptdisks cryptdisks_stop;