/usr/share/fish/completions/fish_indent.fish is in fish-common 2.4.0-1.
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 | complete -c fish_indent -s h -l help --description 'Display help and exit'
complete -c fish_indent -s v -l version --description 'Display version and exit'
complete -c fish_indent -s i -l no-indent --description 'Do not indent output, only reformat into one job per line'
complete -c fish_indent -l ansi --description 'Colorize the output using ANSI escape sequences'
complete -c fish_indent -l html --description 'Output in HTML format'
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