For some reason I remember someone saying (might have been during a
training or git issue) that ElasticSearch would optimize a query_then_fetch
search with size=0 to a count search. But now I can't find anywhere on the
interwebs or in a quick search through the code. Does anyone know if this
is the case or if it really is more important to specify count search_type
rather than size=0 (in this instance, it's in the context of wanting to do
an aggregation and I don't care about the hits).
Thanks in advance
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