[DOCS] Remove extra word (#27989)

docs/reference/query-dsl/has-child-query.asciidoc

@@ -107,7 +107,7 @@ is not mapped.
 
 Parent documents can't be sorted by fields in matching child documents via the
 regular sort options. If you need to sort parent document by field in the child
-documents then you can should use the `function_score` query and then just sort
+documents then you should use the `function_score` query and then just sort
 by `_score`.
 
 Sorting blogs by child documents' `click_count` field: