I am working on a web service that fetches data from various web
services and implements on top of them one common API and other
things. Next to fetching data I also aggregate data from various
places and now I am wondering if there is some mode or way to tell
elasticsearch "Call this url if you find nothing" - this callback
would be some service of mine that returns data exactly the way
So that it queries the callback exactly the way it would query another
node (afair this is done with REST too, isn't it?) but the callback
returns some other aggregated data.
Are there some way to achieve this?