Bug: Invalid role definition [null]

[suckowbiz]

I was asked to move a bug report here (https://github.com/elastic/elasticsearch/issues/26053):

Elasticsearch version (bin/elasticsearch --version): 5.5.1

Plugins installed: [x-pack]

JVM version (java -version): Java SE Runtime 1.7.0_151-b15

OS version (uname -a if on a Unix-like system): Red Hat Enterprise Linux Server release 7.4 (Maipo)

Description of the problem including expected versus actual behavior:

Steps to reproduce:

1. Add --- in first line of /x-pack/roles.yml to apply to convention of valid yaml file (see: http://yaml.org/)
2. Restart elasticsearch

Expected behavior:
Elasticsearch will start without errors.

Actual behavior.
Elasticsarch fails with error. "invalid role"

Provide logs (if relevant):
[2017-08-04T09:20:14,940][ERROR][o.e.x.s.a.s.FileRolesStore] [POC_loghost_node_1] invalid role definition [null] in roles file [/usr/share/elasticsearch/config/x-pack/roles.yml]. skipping role...

[Marius_Dragomir]

I think all of the Elastic products only support one single document inside yml files., so it does fail when using the document separator in YAML.