If you run a search for "i index of password txt best" and actually find a live file belonging to someone else:
grep "index of" /var/log/apache2/access.log i index of password txt best
Sign up for Google Search Console and monitor which of your directories are indexed. Use the "Removals" tool if an open index is accidentally exposed. If you run a search for "i index
find / -name "password.txt" 2>/dev/null
# Index filenames
Get-ChildItem -Path C:\ -Name "password.txt" -Recurse -ErrorAction SilentlyContinue > password_index.txt