[8.x] Add a generic rescorer retriever based on the search request's rescore functionality #119023
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…ore functionality (elastic#118585) This pull request introduces a new retriever called `rescorer`, which leverages the `rescore` functionality of the search request. The `rescorer` retriever re-scores only the top documents retrieved by its child retriever, offering fine-tuned scoring capabilities. All rescorers supported in the `rescore` section of a search request are available in this retriever, and the same format is used to define the rescore configuration. <details> <summary>Example:</summary> ```yaml - do: search: index: test body: retriever: rescorer: rescore: window_size: 10 query: rescore_query: rank_feature: field: "features.second_stage" linear: { } query_weight: 0 retriever: standard: query: rank_feature: field: "features.first_stage" linear: { } size: 2 ``` </details> Closes elastic#118327 Co-authored-by: Liam Thompson <32779855+leemthompo@users.noreply.github.com>
jimczi added >feature :Search Relevance/Ranking 
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mainto8.x:rescorerretriever based on the search request's rescore functionality (#118585)