Here is a blog post guide to understanding why this happens and how to fix it before your data is compromised.
This guide explains what this search string means, how it works, and how to secure your own servers against data leaks. Understanding the Search Query index of password txt link
An page is a default page generated by web servers (like Apache, Nginx, or IIS) when a user requests a directory that does not contain a default index file, such as index.html or index.php . Here is a blog post guide to understanding