Hi, I'm trying to write a search query to:
- perform an ANN search on a dense vector field
- re-rank the returned documents to weight more recent documents higher, according to a custom exponential decay function applied to a 'date' field.
What is the best practice for doing this - using the query rescorer? Does Elasticsearch have built-in support for time weighting?
At the moment
_knn_search endpoint doesn't support rescorers. So you would need to that on your application side.
But we are working on combining _search and _knn_search endpoints, which means there will be an option to use rescorer.
For time weighting, you can either use 1)
script_score query with decay functions on date fields or 2)
function_score query's decay functions
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