It helps, indeed!
I have one big problem: all my queries are built using the AppSearch query syntax, that from what i saw is slightly different from the raw ElasticSearch one.
How can I extract the raw ElasticSearch query from an AppSearch query?
Anyway, please consider adding the percolate queries to EnterpriseSearch as well, I think more and more sites and apps are adding the "saved search" feature 
thank you!