[BUG] Nonexistent page showing in search results.

[nateynateynate]

Describe the bug
At some point our own indexer indexed a page that no longer exists and I can't seem to get it out of the search results.

To Reproduce
Steps to reproduce the behavior:

1. Visit opensearch.org
2. Type 'assistant toolkit' into the search bar in the upper right
3. See several results, fourth one down shows as screenshot. Clicking the result goes to a 404 page.

Expected behavior
This specific result should not show.

Screenshots

Relevant infra configuration (please complete the following information):
opensearch.org production infrastructure.

Additional context
Add any other context about the problem here.

[dblock]

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