title: Opendistro Elasticsearch Give admin level privilege to anonymous user
body: <p>I am trying to give anonymous user admin level privilege to write to certain indices on Opendistro bundle of Elasticsearch. I have updated the config.yml with http.anonymous_auth_enabled: true and also made required changes to role.yml for anonymous_backendrole role.</p>
  
  <p>But I am still getting this error -</p>
  
  <pre><code>{ "error" : { "root_cause" : [ { "type" : "security_exception", "reason" : "no permissions for [cluster:monitor/health] and User [name=opendistro_security_anonymous, roles=[opendistro_security_anonymous_backendrole], requestedTenant=null]" } ], "type" : "security_exception", "reason" : "no permissions for [cluster:monitor/health] and User [name=opendistro_security_anonymous, roles=[opendistro_security_anonymous_backendrole], requestedTenant=null]" }, "status" : 403 }
  </code></pre>
  
  <p>Looking for here if anyone could provide correct way to setup the anonymous auth with Opendistro.</p>