Delegating parts of queries to external indices

Hi all,

I'm working on a project where we have to do searches that are a
combination of traditional searches of the kind that ES handles well, plus
other types of queries that use a specialized index that we'd like to
maintain separately. Is it possible/advisable to write a plugin or
something that could dispatch parts of queries to external indices, parse
the results and merge them with the ES part of the query? I tried to look
around the ES plugin documentation to see what hooks were there, but I
couldn't tell if any of them allowed delegating whole parts of the query
and then merging at the end.

Thanks for your help!


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