Merge branch '9.1' into backport-3048-to-9.1

Author: miguelgrinberg

elasticsearch/esql/functions.py

@@ -649,7 +649,7 @@ def min_over_time(field: ExpressionType) -> InstrumentedExpression:
 
 
 def multi_match(
-    query: ExpressionType, fields: ExpressionType, options: ExpressionType = None
+    query: ExpressionType, *fields: ExpressionType, options: ExpressionType = None
 ) -> InstrumentedExpression:
     """Use `MULTI_MATCH` to perform a multi-match query on the specified field.
     The multi_match query builds on the match query to allow multi-field queries.