This file is indexed.

/etc/apt/apt.conf.d/90fai is in fai-nfsroot 5.0.3ubuntu1.

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

The actual contents of the file can be viewed below.

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// This file is used in the chroot environment from install_packages
// (called by rcS_fai)

// Options for apt-get for FAI
APT
{
  // Options for apt-get
  Get
  {
     Assume-Yes "true";
     Fix-Missing "true";
     Show-Upgraded "true";
     Purge "true";              // really purge! Also removes config files
     List-Cleanup "true";
     ReInstall "false";
  };
};

DPkg
{
  Options {
          "--force-confdef";
          }
};