Can the _suggest endpoint use source filtering?

Currently, a completion suggest request like this:

   "search_suggest" : {
      "completion" : {
         "field" : "name_suggest"
      "prefix" : "nirv"

returns all fields for each hit. I can't find a way to configure it so it just returns the fields I need. Seems like it may be faster if it didn't have to send everything back?

I tried adding _source but I get:

[suggest] does not support [_source]

I'm using elasticsearch 5

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