showRankingScore search parameter, Meilisearch adds a global ranking score field, _rankingScore, to each document. The _rankingScore is between 0.0 and 1.0. The higher the ranking score, the more relevant the document.
Ranking rules sort documents either by relevancy (words, typo, proximity, exactness, attribute) or by the value of a field (sort). Since sort doesn’t rank documents by relevancy, it does not influence the _rankingScore.
A document’s ranking score does not change based on the scores of other documents in the same index.For example, if a document A has a score of
0.5 for a query term, this value remains constant no matter the score of documents B, C, or D._rankingScore. Unlisted settings do not influence the ranking score.