This file is indexed.

/usr/share/bash-completion/completions/icinga2 is in icinga2-common 2.4.1-2ubuntu1.

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

The actual contents of the file can be viewed below.

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_icinga2()
{
  local cur opts
  opts="${COMP_WORDS[*]}"
  cur="${COMP_WORDS[COMP_CWORD]}"
  COMPREPLY=($(icinga2 --autocomplete $COMP_CWORD ${COMP_WORDS[*]} < /dev/null))
  case $COMPREPLY in
    */|*=)
      compopt -o nospace
      ;;
  esac

  return 0
}

complete -F _icinga2 icinga2