Look and Feel API support for Jira Data Center

JRASERVER-63215 was changed to a Suggestion, as this REST API is not supported or documented for Jira Data Center. JRASERVER-63215 was previously raised as a bug that referenced Jira Cloud's REST API documentation, highlighting the unexpected behavior when using the same endpoint in Jira Data Center:

Steps to Reproduce

1. Use REST PUT to alter Color to any color using the following PUT (Example color #ffffff / White)

   curl -k -D- -u user:password -X PUT --data '{"value" : "#ffffff"}' -H "Content-Type: application/json" http://<BASE_URL>/rest/api/2/application-properties/jira.lf.top.bgcolour
   

Expected Results

using the above query the Header Background Color will be changed to white #ffffff and the header navigation bar will reflect the updated value

Actual Results

• the value in the Header Background Color will be changed to white #ffffff
  
• But the color change does not apply to the actual header background color, in the screenshot below the Pink should be white per the defined settings: