This fixes the cause of a warning message in the log files. Changing the sort order for search results in the staff interface (for example, from Relevance to Author (A-Z)) would generate an unnecessary warning message in plack-intranet-error.log: [WARN] Use of uninitialized value $f in hash element at /kohadevbox/koha/Koha/SearchEngine/Elasticsearch/QueryBuilder.pm line 72 5.
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