ElasticSearch Bulk API: Performance with smaller document upserts

For simplicity I wrote a single 'upsert' method in our DAO that will upsert
one or more documents into ES using the _bulk endpoint.

Thinking about it though now I'm worried that for single-doc upserts I may
be forcing the ES server to do a lot more work since it doesn't know if
it's receiving one or thousands of documents.

So, does anybody have a definitive answer? Should I split the DAO method
to use one ES endpoint for single doc upserts and the bulk only when I'm
loading many?

TL;DR: Does the _bulk endpoint use a lot more server resources for a
handful of document inserts than using the normal document insert api?

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