Use Completion Suggester for all the fields of across the Elasticsearch type

I just started using Suggester feature of Elasticsearch and found it cool. I am implementing Completion Suggester in my application, and here goes my requirement: I am using Elasticsearch 5.5.3 (which support multiple types). I have around 10 types in my Elasticsearch and each type has around 10 string fields. What I want to do is make a single search box, that would complete the phrase (of any fields of those 10 types) as user starts typing using completion suggester. What could be the best approach to it? Is using _all field a good idea?

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