Is it possible to run a More Like This (MLT) query searching a particular index, while specifying a source document in a different index, where the source document has different fields?
I'm looking at this documentation:
I thought I could simply specify a different index in the GET (e.g. "[index name]/_search"), but I am not sure how to construct the fields. The fields, as I understand it, are the fields in the source document, but its not clear how you specify the fields in the documents being searched.