Text to go in the release notes:
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This removes a warning message[1] that appears in the reindexing output when using Elasticsearch. The warning was generated if there was no value in 880$6 (880 = Alternate Graphic Representation, $6 = Linkage), but there were other 880 subfields with a value, for example 880$a.
[1] Use of uninitialized value $sub6 in pattern match (m//) at /kohadevbox/koha/Koha/SearchEngine/Elasticsearch.pm line 619.
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