$params['body']['query']['bool']['must'][] = [
            "multi_match" => [
                "query" => $keyword,
                "fields" => ["zwk_bumen", "zwk_kslx","zwk_yrsj", "zwk_zw"]
            ]
];

原文参考：https://www.elastic.co/guide/cn/elasticsearch/guide/current/_most_important_queries.html

下载安装，参考：https://github.com/yosa/predis

引入predis，例如：
require 'vendor/predis/predis/autoload.php'; //以实际路径为准
Predis\Autoloader::register();

使用：

$redis = new Predis\Client(
    [
        'host' => $redisInfo['path'],  //服务器地址
        'port' => $redisInfo['port'],  //端口
        'database' => $redisInfo['select'], //连接数据库
        'password' => $redisInfo['auth'], //密码
    ]
);
$redis->set("test", 11);
var_dump($redis->get("test")); //打印11

背景：
最近用es做数据检索，需要统计满足条件的zwk_zkrs字段的总和，特来记录一下
求和：

$params["body"]["aggs"]["total_zkrs"] = [
   "sum" => [
       "field" => "zwk_zkrs"
   ]
];
求平均值
$params["body"]["aggs"]["avg_zkrs"] = [
   "avg" => [
       "field" => "zwk_zkrs"
   ]
];

注：total_zkrs为自定义内容，sum为求和参数，avg为求平均值，zwk_zkrs为求和字段，
参考文献：
https://www.elastic.co/guide/cn/elasticsearch/guide/current/_aggregation_test_drive.html

$data = array(
  array(
    'id' => 5698,
    'first_name' => 'Bill',
    'last_name' => 'Gates',
  ),
  array(
    'id' => 4767,
    'first_name' => 'Steve',
    'last_name' => 'Aobs',
  ),
  array(
    'id' => 3809,
    'first_name' => 'Mark',
    'last_name' => 'Zuckerberg',
  )
);

//根据字段last_name对数组$data进行降序排列
$last_names = array_column($data,'last_name');
array_multisort($last_names,SORT_DESC,$data);

var_dump($data);

这个报错是因为连不上es服务端导致的
排查步骤:
1、查看host链接是否正确，例如：['http://127.0.0.1:9200']
2、确保host通信正常