Using retrievers in the open source version

Elastic Stack Elasticsearch
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Hi, I’m looking to implement a hybrid search combining kNN and BM25. Is it possible to use retrievers in the open-source version of Elasticsearch to perform this in a single search query instead of using multi-search?

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I already answered at Implementing Hybrid Search with k-NN and BM25 in Elasticsearch Open Source

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Thanks @dadoonet I was thinking we might be able to use different retrievers that available in the open source version, instead of RRF, to combine results from KNN and BM25.

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I think we can continue the discussion in the other thread as it's related.

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