Aggregations of phrases

I have a field that contains text from different sources (it could be a
facebook post, a twitter tweet, a blog article, etc), so it varies in
length.

I need to find common phrases in that field to determine conversation
subjects.

terms aggregations works fine for words, but I need to find phrases, i
guess setting the field to "not_indexed" is not the solution, as the whole
text would be treated as a single item.

Is there anyway to accomplish this?

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