Global Search in Elastic Search

Working on Elasticsearch, my use case is very straight forward. When a user types in a search box I want to search all of my data set irrespective of field or column or any condition (search all data and provide all occurrences of searched word in documents ifacetimeapp). This might be available in their documentation but I'm not able to understand it.
Can somebody explain on this?

You probably wanted the old _all field. Take a look at copy_to instead.

That's probably not a great idea. What if they get a million results?

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