This file is indexed.

/usr/share/zsh/functions/Zftp/zfclose is in zsh-common 5.1.1-1ubuntu2.

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

The actual contents of the file can be viewed below.

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# function zfclose {
[[ $curcontext = :zf* ]] || local curcontext=:zfclose
zftp close
# }