Speed up property function

abcd/backends/atoms_opensearch.py

@@ -533,8 +533,7 @@ def count(self, query: Union[dict, str, None] = None) -> int:
     def property(self, name, query: Union[dict, str, None] = None) -> list:
         """
         Gets all values of a specified property for matching documents in the
-        database. This method is very slow, so it is preferable to use
-        alternative methods where possible, such as count_property.
+        database. Alternative methods, such as count_property, may be faster.
 
         Parameters
         ----------
@@ -551,15 +550,16 @@ def property(self, name, query: Union[dict, str, None] = None) -> list:
         }
 
         return [
-            hit["_source"][format(name)]
+            hit["fields"][format(name)][0]
             for hit in helpers.scan(
                 self.client,
                 index=self.index_name,
                 query=query,
-                stored_fields=format(name),
-                _source=format(name),
+                _source=False,
+                stored_fields="_none_",
+                docvalue_fields=[format(name)],
             )
-            if format(name) in hit["_source"]
+            if format(name) in hit["fields"]
         ]
 
     def count_property(self, name, query: Union[dict, str, None] = None) -> dict: