Where to install RESTful data stores - ES and MongoDB in Snappy Ubuntu?

The scenario is about development of nodejs application that uses RESTful data stores - Elasticsearch and MongoDB, but does not need to distribute ES and Mongo with the application itself.
I am using Pi-3 with Snappy Ubuntu. As far as I understand, I can create a snap with nodejs plugin for the application, but I am not sure if I need (or will be good to have) another snap to run the data stores.

Typically you would just bundle everything into one snap package (using different “parts” and “apps” blocks in your snapcraft.yaml)…

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