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index 'index_prefix' can only be lowercase #3476
What you can insert into the GUI as index_prefix can be used and will be valid. For all non valid options you should get an error.
You are able to use UPPERCASE in this field, but that will not work in the end. If a User did not check the Logfile he only notice that something might be wrong, because ES Offloading is disabled (but no error is shown)
Check the input of the fields, and write it additional to the information text.
Steps to Reproduce (for bugs)
Not every User will spot this issue in the first run and only see that the Journal get filled or no messages are present for search and did not identify the issue.