Fix ranking score bug when sort is present

- Fix global_score function to properly handle semantic scores and ranking scores
- Prioritize semantic scores (vector/embedding) when available, fall back to ranking scores
- Exclude sort and geo sort details from relevance scoring
- Use Rank::global_score to properly merge ranking scores
- Add test case with insta snapshots to reproduce and verify the fix
- When sorting is present, ranking scores now properly reflect search relevance
- Previously all ranking scores were 1.0 when sort was present, now they show actual relevance scores

crates/meilisearch/tests/search/mod.rs

@@ -2127,3 +2127,102 @@ async fn simple_search_changing_unrelated_settings() {
         })
         .await;
 }
+
+#[actix_rt::test]
+async fn ranking_score_bug_with_sort() {
+    let server = Server::new_shared();
+    let index = server.unique_index();
+
+    // Create documents with a "created" field for sorting
+    let documents = json!([
+        {
+            "id": "1",
+            "title": "Coffee Mug",
+            "created": "2023-01-01T00:00:00Z"
+        },
+        {
+            "id": "2",
+            "title": "Water Bottle",
+            "created": "2023-01-02T00:00:00Z"
+        },
+        {
+            "id": "3",
+            "title": "Tumbler Cup",
+            "created": "2023-01-03T00:00:00Z"
+        },
+        {
+            "id": "4",
+            "title": "Stainless Steel Tumbler",
+            "created": "2023-01-04T00:00:00Z"
+        }
+    ]);
+
+    // Add documents
+    let (task, code) = index.add_documents(documents, None).await;
+    assert_eq!(code, 202, "{task}");
+    server.wait_task(task.uid()).await.succeeded();
+
+    // Configure sortable attributes
+    let (task, code) = index
+        .update_settings(json!({
+            "sortableAttributes": ["created"]
+        }))
+        .await;
+    assert_eq!(code, 202, "{task}");
+    server.wait_task(task.uid()).await.succeeded();
+
+    // Test 1: Search without sort - should have proper ranking scores
+    index
+        .search(
+            json!({
+                "q": "tumbler",
+                "showRankingScore": true,
+                "rankingScoreThreshold": 0.0,
+                "attributesToRetrieve": ["title"]
+            }),
+            |response, code| {
+                assert_eq!(code, 200, "{response}");
+                snapshot!(json_string!(response["hits"]), @r###"
+                [
+                  {
+                    "title": "Tumbler Cup",
+                    "_rankingScore": 0.9848484848484848
+                  },
+                  {
+                    "title": "Stainless Steel Tumbler",
+                    "_rankingScore": 0.8787878787878788
+                  }
+                ]
+                "###);
+            },
+        )
+        .await;
+
+    // Test 2: Search with sort - this is where the bug occurs
+    index
+        .search(
+            json!({
+                "q": "tumbler",
+                "showRankingScore": true,
+                "rankingScoreThreshold": 0.0,
+                "sort": ["created:desc"],
+                "attributesToRetrieve": ["title"]
+            }),
+            |response, code| {
+                assert_eq!(code, 200, "{response}");
+                snapshot!(json_string!(response["hits"]), @r###"
+                [
+                  {
+                    "title": "Tumbler Cup",
+                    "_rankingScore": 0.9848484848484848
+                  },
+                  {
+                    "title": "Stainless Steel Tumbler",
+                    "_rankingScore": 0.8787878787878788
+                  }
+                ]
+                "###);
+            },
+        )
+        .await;
+}

crates/milli/src/score_details.rs

@@ -67,14 +67,22 @@ impl ScoreDetails {
     }
 
     pub fn global_score<'a>(details: impl Iterator<Item = &'a Self> + 'a) -> f64 {
-        Self::score_values(details)
-            .find_map(|x| {
-                let ScoreValue::Score(score) = x else {
-                    return None;
-                };
-                Some(score)
-            })
-            .unwrap_or(1.0f64)
+        // Filter out only the ranking scores (Rank values) and exclude sort/geo sort
+        let mut semantic_score = None;
+        let ranking_ranks = details.filter_map(|detail| match detail.rank_or_value() {
+            RankOrValue::Rank(rank) => Some(rank),
+            RankOrValue::Score(score) => {
+                semantic_score = Some(score);
+                None
+            }
+            RankOrValue::Sort(_) => None,
+            RankOrValue::GeoSort(_) => None,
+        });
+
+        let ranking_score = Rank::global_score(ranking_ranks);
+
+        // If we have semantic score, use it, otherwise use ranking score
+        semantic_score.unwrap_or(ranking_score)
     }
 
     pub fn score_values<'a>(