It seems we cannot do an explain query using the Lucene extension if we change the index name, e.g: setting the name attribute of an @Index annotation. On attach I will leave a patch to reproduce the case, it targets the showcase IT module, I didn’t have the time to understand if the issue is due by the mapper or by the backend side. E.g: changing the index name from Book to book (all lowercase) the error message will be:
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