There is a 'Troubleshooting Indices' link at the bottom of the main description on the project page → . It links to https://github.com/pantheon-systems/search_api_pantheon/blob/8.x/docs/TR... which gives a 404 result page from GitHub.
Click the link.
Updated the link to the intended page URL.
Fixed
8.1
Documentation
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
Following up on this, I think this is a quick fix, just need to update the link to point to https://github.com/pantheon-systems/search_api_pantheon/wiki/TROUBLESHOOTING-INDICES
Attached screenshot of what needs to be updated, this should be an easy fix for maintainer with edit access to the module page description.
Automatically closed - issue fixed for 2 weeks with no activity.