laravel-admin+elasticsearch升级PHP到7.3的一些问题整理

项目中使用laravel-admin，版本为：5.3.31，是老版本了。但是最近要升级软件环境，将PHP版本由5.6.34升级到7.3.28，升级后引出一系列问题，其他问题逐一解决，基本都是些函数弃用的问题。

但是项目中用到elasticsearch，搜索时报错：{“error”:“Content-Type header [] is not supported”,“status”:406}，出现问题后网上也搜了一下，大都是curl请求时需要增加头部信息，问题也确实出在这，但是解决方法大都是命令行， 如：curl -H “Content-Type: application/json” -XPOST。一般命令行请求确实可以解决。
ES中需要改动部分文件。
解决办法为：找到文件：
CODE-XXXvendorelasticsearchelasticsearchsrcElasticsearchConnectionsConnection.php
构造方法中参数初始化，增加Content-Type等参数，如下：

    public function __construct($handler, $hostDetails, $connectionParams,
                                SerializerInterface $serializer, LoggerInterface $log, LoggerInterface $trace)
    {
        if (isset($hostDetails['port']) !== true) {
            $hostDetails['port'] = 9200;
        }

        if (isset($hostDetails['scheme'])) {
            $this->transportSchema = $hostDetails['scheme'];
        }

        if (isset($hostDetails['user']) && isset($hostDetails['pass'])) {
            $connectionParams['client']['curl'][CURLOPT_HTTPAUTH] = CURLAUTH_BASIC;
            $connectionParams['client']['curl'][CURLOPT_USERPWD] = $hostDetails['user'].':'.$hostDetails['pass'];
        }

        
        //升级php7.3+后，es搜索报错：{"error":"Content-Type header [] is not supported","status":406}
        //请求时需增加头部信息即可
        $connectionParams['client']['curl'][CURLOPT_HTTPHEADER] =  ['Accept: application/json', 'Content-Type: application/json'];

        $host = $hostDetails['host'].':'.$hostDetails['port'];
        $path = null;
        if (isset($hostDetails['path']) === true) {
            $path = $hostDetails['path'];
        }
        $this->host             = $host;
        $this->path             = $path;
        $this->log              = $log;
        $this->trace            = $trace;
        $this->connectionParams = $connectionParams;
        $this->serializer       = $serializer;

        $this->handler = $this->wrapHandler($handler, $log, $trace);
    }