In ElasticSearch, should I use multiple indexes for separate but related entities?

Question

The overhead of adding indexes is well-documented, but I have not been able to find good information on when to use multiple indexes with regards to the various document types b

Answer 1

A very interesting video explaining elasticsearch "Data Design Patterns" by Shay Banon:

http://vimeo.com/44716955

This exact question is answered at 13:40 where examining different data flows, by looking at the concepts of Type, Filter and Routing

Regards