Please refer to the screenshot below:
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I’ve run across this before. The search term search_term_string comes from the sitelinks search term tag that’s added to the head tag of all Discourse sites. Its intended use is to allow users to search a Discourse site from the browser’s address bar.
My understanding is that bots can somehow trigger this without entering an actual search term. When that happens {search_term_string} gets added to the search logs.
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