elasticsearch/elasticsearch-definitive-guide — pull request #143 by mysza (2014-07-29 14:40:15+00:00)
Title: Changed "popular_colors" to "colors"

The initial aggregation name was "popular_colors", but later in the text (this and next page), "colors" is used as a name of the aggregation. I changed the "popular_colors" to "colors", to match.