// aggregations/bucket/terms-aggregation.asciidoc:806 [source, php] ---- $params = [ 'body' => [ 'aggs' => [ 'actors' => [ 'terms' => [ 'field' => 'actors', 'size' => 10, 'collect_mode' => 'breadth_first', ], 'aggs' => [ 'costars' => [ 'terms' => [ 'field' => 'actors', 'size' => 5, ], ], ], ], ], ], ]; $response = $client->search($params); ----