This is a page I've encountered while browsing your blog posts.
Click any internal link to other elastic/found blog article, e.g.
Elasticsearch Internals: An Overview
Do notice the trailing slash
GET /blog/found-writing-a-plugin/results in
302 Moved Temporarilyto
blog/found-writing-a-plugin(no leading and no trailing slashes).
The browser interprets this as a relative path to be added to the current path, i.e.
I saw this only on found blog posts. Probably this is a migration issue.
To fix I think you need to change the nginx rewrite rule to include the leading slash. Or at very least drop the trailing slash from the links in the posts.