There's something I would like to understand about the suggester completion, it looks like
that in _search query "text" has been replaced by "prefix" in ES 5.0.
I'm not able to verify it and most of all to find the document which explain it.
the other thing is that having a look at
SuggestionBuilder.java and there still present the "text" property HERE
I didn't find any doc page which remove text property in favor of prefix, can you help me please ?