Hey all - we've recently introduced new functionality on two fronts that will certainly help with the use case at hand:
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A way to use existing Elasticsearch indices with App Search. You can still create and managed indices (via engines) with App Search, but this gives you more flexibility on where and how the data is indexed. If some restaurants are bring your own wine, App Search is now bring your own Elasticsearch index
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A way to use the Elasticsearch Query DSL for any App Search engine. This means even the most demanding of queries can be issued against App Search engines, with all the automatic goodness of Analytics capture, for example.
Hope this helps you all on this thread, and perhaps any other peer that stumbles upon this thread!
-- Jonas