Hi! How can I create a facet combining 2 (or more) different fields, without using copy field to union them? For example if I have this documents: Doc1 with the field X contains the value a and field Y contains the value b Doc2 with the field X contains the value c and field Y contains the value a Doc3 with the field X contains the value d and field Y contains the value d I want to get this facet: XY a 2 b 1 c 1 d 1
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