Is there any option for highlight to highlight the results in "_source"?

Hey,
I'm writing a node.js application that uses ES,
I want the results from my search to appear highlighted when they're shown in the HTML.
How should I use it?
The best option is that highlight will highlight the relevant words in "_source".

UP!!!!

You can't do that with _source field but with other fields. Or you can store the full JSon again in another field and highlight it.