In seemingly all web browsers, ElasticSearch Sense webUI initially truncates the output view of JSON - In this screenshot, you can see the output truncated, as you don't see closing JSON curly braces '}' at the bottom of visible output:
How can I see the full output un-truncated?
I am posting initial Answers here that I discovered, and in general, I'm posting this to help others, as I haven't found any report of this "bug" or solutions anywhere on the web.
Side question: Does ElasticSearch Sense have any bug reporting mechanism? I would have already reported this bug if I could find how; so this is another reason I am posting this.
Magnify your web browser larger (I think it might also work with smaller) - then output is expanded, like you can see in this image, as you can now see the closing curly braces '&' at the bottom of JSON output (I collapsed the "otherNames" mapping so it all fits within this view).
This seems to "persist" the fix: No truncation in any further queries, or after refresh (even hard), or cache clear. Although I'm not sure if it would become truncated again after a machine restart...