Delete a dot only at the end of the string

marc_to_solr/lib/traject_config.rb

@@ -895,7 +895,7 @@
   next if subjects.present?
   record.fields.select { |field| field.tag[0] == '6' }.each do |field|
     next unless field['2'] == 'fast'
-    value = field['a']&.delete('.')
+    value = field['a']&.delete_suffix('.')
     accumulator << value
   end
 end