There isn’t one way to determine what should be pinned which is why we don’t offer one out of the box. You’ll need to build something that suits your needs but we do have features that can help.
If you store user search strings an index as a ‘keyword’ field type you can use the ‘terms’ aggregation to find the most popular ones. I’d recommend also storing the ids of products they clicked on and their positions in the search results. This will help determine which products might be useful to pin to the top of search results.
Yes, like anything else these would be JSON documents in an index.
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