Group data on aggregations

Hi,
I've some related terms in a field, with the graph tool I can connect it:

What I'm looking for is a way to group all this terms as one in an aggregation.
What I get now:

skills: Descending | Count

agile and lean startups | 14
lean ux | 14
agile | 8
javascript | 8
html | 6
What I expect:

skills: Descending | Count

agile and lean startups | 36
javascript | 8
html | 6
It's possible to do with the current version of ES?

Thanks

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