Fix more tests

Author: svilen-mihaylov-elastic

x-pack/plugin/esql/qa/testFixtures/src/main/resources/multi-match-function.csv-spec

@@ -7,7 +7,7 @@ required_capability: multi_match_unified_function
 
 // tag::multi-match-with-field[]
 FROM books
-| WHERE MULTI_MATCH(author, description, "Faulkner")
+| WHERE MATCH(author, description, "Faulkner")
 | KEEP book_no, author
 | SORT book_no
 | LIMIT 5
@@ -28,7 +28,7 @@ testMultiMatchWithOptionsFuzziness
 required_capability: multi_match_unified_function
 
 from books 
-| where multi_match(title, description, "Pings", {"fuzziness": 1})  
+| where match(title, description, "Pings", {"fuzziness": 1})  
 | keep book_no;
 ignoreOrder:true
 
@@ -50,7 +50,7 @@ required_capability: multi_match_unified_function
 
 // tag::multi-match-with-named-function-params[]
 FROM books
-| WHERE MULTI_MATCH(title, description, "Hobbit Back Again", {"operator": "AND"})
+| WHERE MATCH(title, description, "Hobbit Back Again", {"operator": "AND"})
 | KEEP title;
 // end::multi-match-with-named-function-params[]
 
@@ -64,7 +64,7 @@ testMultiMatchWithOptionsMinimumShouldMatch
 required_capability: multi_match_unified_function
 
 from books 
-| where multi_match(title, description, "here back again", {"minimum_should_match": 2, "operator": "OR"})
+| where match(title, description, "here back again", {"minimum_should_match": 2, "operator": "OR"})
 | sort book_no
 | keep title;
 
@@ -78,7 +78,7 @@ required_capability: multi_match_unified_function
 required_capability: full_text_functions_disjunctions_compute_engine
 
 from books 
-| where multi_match(title, description, "lord") or length(title) > 130 
+| where match(title, description, "lord") or length(title) > 130 
 | keep book_no
 ;
 ignoreOrder: true
@@ -100,7 +100,7 @@ testMultiMatchPhraseQuery
 required_capability: multi_match_unified_function
 
 from books 
-| where multi_match(title, description, "Lord of the rings", { "type": "phrase" } )
+| where match(title, description, "Lord of the rings", { "type": "phrase" } )
 | keep title
 ;
 ignoreOrder: true
@@ -120,7 +120,7 @@ testMultiMatchPhrasePrefixQuery
 required_capability: multi_match_unified_function
 
 from books 
-| where multi_match(title, "Lord of the ri", { "type": "phrase_prefix" } )
+| where match(title, "Lord of the ri", { "type": "phrase_prefix" } )
 | keep title
 ;
 ignoreOrder: true

x-pack/plugin/esql/qa/testFixtures/src/main/resources/scoring.csv-spec

@@ -119,7 +119,7 @@ required_capability: multi_match_unified_function
 required_capability: metadata_score
 
 from books metadata _score
-| where multi_match(author, title, "Mark", {"fuzziness": 1})
+| where match(author, title, "Mark", {"fuzziness": 1})
 | keep book_no, title, author, _score;
 ignoreOrder:true
 
@@ -132,7 +132,7 @@ required_capability: multi_match_unified_function
 required_capability: metadata_score
 
 from books metadata _score
-| where multi_match(description, title, "Hobbit", {"type": "best_fields"})
+| where match(description, title, "Hobbit", {"type": "best_fields"})
 | sort book_no
 | eval _score = round(_score)
 | keep book_no, _score;
@@ -159,7 +159,7 @@ required_capability: multi_match_unified_function
 required_capability: metadata_score
 
 from books metadata _score
-| where multi_match(description, title, "Hobbit", {"type": "most_fields"})
+| where match(description, title, "Hobbit", {"type": "most_fields"})
 | sort book_no
 | eval _score = round(_score)
 | keep book_no, _score;

x-pack/plugin/esql/src/internalClusterTest/java/org/elasticsearch/xpack/esql/plugin/ScoringIT.java

@@ -46,7 +46,6 @@ protected Collection<Class<? extends Plugin>> nodePlugins() {
     public static List<Object[]> params() {
         List<Object[]> params = new ArrayList<>();
         params.add(new Object[] { "match(content, \"fox\")" });
-        params.add(new Object[] { "multi_match(content, \"fox\", {\"operator\": \"AND\"})" });
         params.add(new Object[] { "content:\"fox\"" });
         params.add(new Object[] { "qstr(\"content: fox\")" });
         params.add(new Object[] { "kql(\"content*: fox\")" });

x-pack/plugin/esql/src/test/java/org/elasticsearch/xpack/esql/optimizer/LocalPhysicalPlanOptimizerTests.java

@@ -1317,7 +1317,7 @@ public void testQStrOptionsPushDown() {
     public void testMultiMatchOptionsPushDown() {
         String query = """
             from test
-            | where MULTI_MATCH(first_name, last_name, "Anna", {"fuzzy_rewrite": "constant_score", "slop": 10, "analyzer": "auto",
+            | where MATCH(first_name, last_name, "Anna", {"fuzzy_rewrite": "constant_score", "slop": 10, "analyzer": "auto",
             "auto_generate_synonyms_phrase_query": "false", "fuzziness": "auto", "fuzzy_transpositions": false, "lenient": "false",
             "max_expansions": 10, "minimum_should_match": 3, "operator": "AND", "prefix_length": 20, "tie_breaker": 1.0,
             "type": "best_fields", "boost": 2.0})