You can view official Elasticsearch documentation right in your IDE. There are two ways to get the documentation.
Invoke code completion popup ⌃ Space, select the endpoint and press F1
Put the cursor at the request path or QueryDSL keyword and press F1
When you press F1, the Documentation popup is shown. If you press F1 second time the Documentation tool window is shown.
To open the documentation in browser click the link at the top of the documentation.