Preserve cross-field search matching

CHANGELOG.md

@@ -3,7 +3,7 @@
 ## Не выпущено
 
 - Backend обновлён до `0.10.3`: запрос о налоге на прибыль поднимает действующий
-  Налоговый кодекс; релевантность текста и названия оценивается раздельно.
+  Налоговый кодекс; точное совпадение фразы дополнительно усиливает результат.
 - Backend обновлён до `0.10.2`: действующие документы ранжируются выше, а
   утратившие силу — после остальных; из лаборатории удалён пустой блок фрагмента.
 - Backend обновлён до `0.10.1`: поисковая выдача по регистрации больше не

backend/search/query.py

@@ -100,17 +100,22 @@ def tax_profit_clauses(language: str, query: str) -> list[dict]:
 def build_search_query(language: str, query: str) -> dict:
     registration_clauses = company_registration_clauses(language, query)
     intent_clauses = [*registration_clauses, *tax_profit_clauses(language, query)]
-    operator = "OR" if registration_clauses else "AND"
     full_text = [
-        clause
+        {
+            "multi_match": {
+                "query": variant,
+                "fields": [f"document_name_{language}^4", f"text_{language}"],
+                "type": "cross_fields",
+                "operator": "OR" if registration_clauses else "AND",
+            }
+        }
         for variant in query_variants(language, query)
-        for clause in (
-            {"match": {f"text_{language}": {"query": variant, "operator": operator}}},
-            {"match": {f"document_name_{language}": {"query": variant, "operator": operator, "boost": 4}}},
-            {"match_phrase": {f"text_{language}": {"query": variant, "boost": 3}}},
-        )
     ]
-    planned = {"should": [*full_text, *intent_clauses], "minimum_should_match": 1}
+    phrase_matches = [
+        {"match_phrase": {f"text_{language}": {"query": variant, "boost": 3}}}
+        for variant in query_variants(language, query)
+    ]
+    planned = {"should": [*full_text, *phrase_matches, *intent_clauses], "minimum_should_match": 1}
     return {"bool": planned}
 
 

backend/test_search_api.py

@@ -47,7 +47,7 @@ class SearchApiTest(unittest.TestCase):
             self.assertEqual(planned["minimum_should_match"], 1)
             self.assertNotIn("filter", planned)
             self.assertTrue(any("constant_score" in clause for clause in planned["should"]))
-            self.assertTrue(any("общество с ограниченной ответственностью" in clause.get("match", {}).get("text_ru", {}).get("query", "") for clause in planned["should"]))
+            self.assertTrue(any("общество с ограниченной ответственностью" in clause.get("multi_match", {}).get("query", "") for clause in planned["should"]))
 
     def test_production_api_boosts_tax_code_for_profit_tax_query(self):
         with tempfile.TemporaryDirectory() as temporary:

backend/test_search_relevance.py

@@ -38,7 +38,9 @@ class SearchRelevanceTest(unittest.TestCase):
         self.assertFalse(body["track_total_hits"])
         self.assertEqual(body["collapse"], {"field": "document_code"})
         self.assertIn({"term": {"is_current_edition": True}}, body["query"]["bool"]["filter"])
-        lexical_query = body["query"]["bool"]["must"]["bool"]["should"][0]["match"]["text_ru"]
+        lexical_query = body["query"]["bool"]["must"]["bool"]["should"][0]["multi_match"]
+        self.assertEqual(lexical_query["type"], "cross_fields")
+        self.assertEqual(lexical_query["fields"], ["document_name_ru^4", "text_ru"])
         self.assertEqual(lexical_query["operator"], "AND")
         self.assertTrue(any("match_phrase" in clause for clause in body["query"]["bool"]["must"]["bool"]["should"]))
 
@@ -56,8 +58,8 @@ class SearchRelevanceTest(unittest.TestCase):
             search_query = body["query"]["bool"]["must"]["bool"]
             self.assertEqual(search_query["minimum_should_match"], 1)
             self.assertNotIn("filter", search_query)
-            lexical = [clause["match"] for clause in search_query["should"] if "match" in clause]
-            self.assertTrue(all(next(iter(clause.values()))["operator"] == "OR" for clause in lexical))
+            lexical = [clause["multi_match"] for clause in search_query["should"] if "multi_match" in clause]
+            self.assertTrue(all(clause["type"] == "cross_fields" and clause["operator"] == "OR" for clause in lexical))
             boosts = [clause["constant_score"] for clause in search_query["should"] if "constant_score" in clause]
             self.assertEqual([item["boost"] for item in boosts], [boost for _, boost in COMPANY_REGISTRATION_DOCUMENTS])
             self.assertEqual(