Can a suggester query search on multi-fields?

The suggester query example in the reference like this:
curl -X POST 'localhost:9200/music/_suggest?pretty' -d '{
"song-suggest" : {
"text" : "n",
"completion" : {
"field" : "suggest"
}
}
}'
I want to build a suggester query search on some fields. No just on suggest field.
Is Elasticsearch support it now?