In (0) you can see a test that uses lang instead of id to get around the bug fixed by #25736

This test, however, should be failing since it doesn't specify both lang and id which are marked as required in the API spec. This suggests that either the test is not being run as it should or that the test runner doesn't check for all required attributes.

0 - https://github.com/elastic/elasticsearch/blob/5.x/modules/lang-painless/src/test/resources/rest-api-spec/test/painless/16_update2.yaml#L7-L9