If I use the search type "dfs_query_then_fetch", as I understand it the
first step of the search is to go to each of the shards collecting the
inverse document frequencies.
If I was searching across multiple indexes, would it collect the idfs from
each of the indexes and combine them?
E.g. if I randomly split an index in half (e.g. "unsecured" and "secured"),
if I did a search across both of those indexes, would the results (and
their scores) be roughly similar to if I had all the documents in one index
and just did the search on that?
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