Basic question for a Vespa newbie: In ElasticSearch I stand up a cluster of some number of nodes using best practices. I then create an Index for each of my tenants/clients, thus walling off my clients data from each other. I grow/shape the Elastic cluster as necessary to handle load.
What would be the analogous terms in Vespa parlance?
In Vespa, a client will have its schema in an Application Package, and be deployed on a set of nodes. This gives total isolation.
It is possible to have multiple schemas in an application package, see https://docs.vespa.ai/en/schemas.html#multiple-schemas, running on the same set of nodes - or even on different nodes using different clusters. This can be useful for clients with many applications that are OK to co-locate on same node set.
Hence, many ways to set up, depending on how well you want to isolate the applications.
Further reading:
The equivalent to different indexes in ES is to have different schemas: Each schema in a content cluster gets its own indexes and other data structures.
Note that (as in ES) this isn't perfect isolation:
You can achieve all of these of course by setting up different Vespa system instances for each tenant, at the cost of additional administration overhead and running different (e.g Docker) containers for each.
In principle you can also create a single system hosting multiple applications, where each application runs on different Docker containers and is therefore fully isolated. This is what Vespa Cloud does, but it's a lot more work and not documented.
