How call I make one request for all cores and get response classified by cores

I have a group of subindex, each of which is a core in my solr now. I want to make one query for some of them, how can I do that? And classify response doc by index, using facet search? Thanks Kun

Re: How call I make one request for all cores and get response classified by cores

: I have a group of subindex, each of which is a core in my solr now. I want : to make one query for some of them, how can I do that? And classify response : doc by index, using facet search? some background: "multi core" is when you have multiple solr "cores" on one solr instance; each "core" c