Suggest on body field

Hello, I'm interested is there a way to accomplish following use case:

Lets suppose I have bunch of documents indexed, the only field that each
document have - is html body, there is not tags, titles etc.

Is there a way to suggest user relevant word while he is typing it based on
given index?

ps: I have attached sample dump of data from superuser.com dump with which
I'm playing now

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