[jira] [Created] (SOLR-18245) Add reRerankCutoff Output For LTR Based Sorts

["Darren Shaw (Jira)" <ji...@apache.org>]

Darren Shaw created SOLR-18245:
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             Summary: Add reRerankCutoff Output For LTR Based Sorts
                 Key: SOLR-18245
                 URL: https://issues.apache.org/jira/browse/SOLR-18245
             Project: Solr
          Issue Type: Improvement
          Components: ltr
            Reporter: Darren Shaw


h1. Context

When using LTR, a client may need to know the sort score that a document would have required to have been eligible for rerank by LTR.

This is best illustrated by the following real-world example.
h2. Example Use Case

Solr is used in a retail environment where documents represent products. One element that contributes to the sort score and therefore the document ordering is a field called {{{}commercialUplift{}}}. This allows the retailer to increase the score of a document due to commercial factors that are not directly tied to the relevance of the document.

This {{commercialUplift}} is just one element used in the sort scoring function.

Given a page of results the retailer needs to to know the sort score another document would require to have been included in that page and therefore the {{commercialUplift}} value that would have been needed to increase a document's score enough to get in to that page.

With a non-LTR search it is possible to do this by retrieving the sort score of the lowest ranked document in a page of results.

But with LTR and its two stage ranking, in cases where the {{reRankDocs}} size is greater than the page size ({{{}rows{}}}) and all documents are not re-ranked, this is not possible. As well as the rerank scores output in the final page of results, the retailer would need to know the original sort score required for a document to have been included in the rerank stage (the score of the lowest ranked document in the main sort scoring, before re-ranking).
h1. Requirement

Add a parameter to LTR queries to output a rerank cutoff value in the response header. This value would be the original sort value(s) of the lowest ranked document that was eligible for reranking.



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