Display string list returned by scripted field in new line in discovery

[AClerk]

Formatting strings using scripted fields - inserting line breaks

I've tried scripted fields, I've used lang=painless, type=string, format=string, script=/\n/.matcher(doc['message'].value).replaceAll(' ') but then I receive this error "Courier Fetch: 10 of 715 shards failed. The script might be written wrong... I've tried doc['message'].value = "\n" + " /\n/.matcher(doc['message'].value).replaceAll(' ') Wondering how I can debug or test a scripted field......

How can I add a newline character to a String in Java?