I posted this question to facebook.stackoverflow.com yesterday: Changing open graph image tag based on blog post item, but it does not appear in the site level search. I searched both by its title and by copy and pasting the bulk of its body. It has been indexed by google. Can anyone explain why it doesn't appear in the site level search results?
You don't get this if you don't do a literal search (with quotation marks as shown above) because image is one of the top tags on Stack Overflow. As such, when it shows up as a term in a search, it is automatically converted into a tag search with that tag. This is so that if someone searches for a ludicrously common thing (like, say, c# or java), we just point them at the tag search for that.
As such, if you want to search for a term that happens to be a common tag, you need to escape it. You can use
Your question doesn't have image, so it will not show up. The above image demonstrates the auto-tag-search functionality for the particular title string.