1// getting-started.asciidoc:665
2
3[source, php]
4----
5$params = [
6    'index' => 'bank',
7    'body' => [
8        'size' => 0,
9        'aggs' => [
10            'group_by_state' => [
11                'terms' => [
12                    'field' => 'state.keyword',
13                ],
14                'aggs' => [
15                    'average_balance' => [
16                        'avg' => [
17                            'field' => 'balance',
18                        ],
19                    ],
20                ],
21            ],
22        ],
23    ],
24];
25$response = $client->search($params);
26----
27