"Recent" sort is not indexing recently-posted questions with specific keywords or tags

From Chris Miller's post:
(https://answers.atlassian.com/questions/181552/atlassian-answers-search-by-recent-not-picking-up-recent-entries)

Hello,

For about a month the answers page has stopped updating "most recent entries" on my keyword search I use as a default. For example, I work at Zephyr, so have the following URL string as a saved tab when I open my browser: https://answers.atlassian.com/search/?sort=recent&q=Zephyr&t=question

The most recent entry that populates is from April 1.

However the email triggers I have set continue to work fine, and my team can continue to pick up more recent entries like the following.

https://answers.atlassian.com/questions/179777/can-we-change-the-image-for-test-cycles-folder?page=1#181506

The above doesn't appear in my search results, though I would expect it.

Chris