Enable self approval of merge requests not available in API

Summary

Approval configuration parameter "Enable self approval of merge requests" not visible in API.

Steps to reproduce

  1. Look up the documentation: https://docs.gitlab.com/ee/api/merge_request_approvals.html#change-configuration
  2. See that there is no parameter for said option.

What is the current bug behavior?

Cannot set or change the said option through the API.

What is the expected correct behavior?

The option to set the option through the API.

Relevant logs and/or screenshots

image

Results of GitLab environment info

Expand for output related to GitLab environment info 
System information
System:         
Proxy:          https_proxy: http://:
http_proxy: http://:
no_proxy: alm.brand.dk
Current User:   git
Using RVM:      no
Ruby Version:   2.5.3p105
Gem Version:    2.7.6
Bundler Version:1.16.6
Rake Version:   12.3.2
Redis Version:  3.2.12
Git Version:    2.18.1
Sidekiq Version:5.2.3
Go Version:     unknown


GitLab information
Version:        11.7.5-ee
Revision:       ed04633
Directory:      /opt/gitlab/embedded/service/gitlab-rails
DB Adapter:     postgresql
DB Version:     9.6.11
URL:            https://
HTTP Clone URL: https:///some-group/some-project.git
SSH Clone URL:  git@:some-group/some-project.git
Elasticsearch:  no
Geo:            no
Using LDAP:     yes
Using Omniauth: yes
Omniauth Providers:


GitLab Shell
Version:        8.4.4
Repository storage paths:
  • default: /var/opt/gitlab/git-data/repositories Hooks: /opt/gitlab/embedded/service/gitlab-shell/hooks Git: /opt/gitlab/embedded/bin/git