Opensearch is not working on plugins

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: --Sprint 12/11, 6.1.0 CE RC1, 6.1.0 CE GA1
• Fix Version/s: --Sprint 12/11, 6.1.0 CE RC1
• Component/s: Search Infrastructure, Search Infrastructure > Framework, Web Search > Search Widgets
• Labels:
  • QA-R
  • knowledgebase
  • search
  • search_portlet
• Caused by: Other (provide details)
• Where was the bug?:
  JSP
• Git Pull Request: https://github.com/brianchandotcom/liferay-portal/pull/2731

Opensearch is not working on plugins (tested on todays's trunk with a new plugin and with knowledge base)
It simply doesn't appear in the search results.
To test this:
create a new knowledge base article
Search for it in the search portlet

Nothing appears