Logstash reference error

[vector4wang (wangxc)]

confi content

input {
    jdbc {
        jdbc_driver_library => "D:\repo\com\microsoft\sqlserver\sqljdbc4\4.0\sqljdbc4-4.0.jar"    
        jdbc_driver_class => "com.microsoft.sqlserver.jdbc.SQLServerDriver"
        jdbc_connection_string => "jdbc:sqlserver://xxx:8838;DatabaseName=LieBiDe"
        jdbc_user => "xxx"
        jdbc_password => "xxx"
        statement => "SELECT TOP 1 j.Id, j.Name AS title, j.Location, f.Name AS company, f.ShortName, j.EmergencyDegree, j.created, r.JobId, r.created FROM Jobs j LEFT JOIN Firms f ON j.FirmId = f.Id LEFT JOIN Recommendations r ON j.id = r.JobId;"
        #parameters => { "id" => 3510 }
		codec => plain{ charset => "GBK" }
    }
}
filter {
    jdbc_streaming {
        jdbc_driver_library => "D:\repo\mysql\mysql-connector-java\5.1.40\mysql-connector-java-5.1.40.jar"
        jdbc_driver_class => "com.mysql.jdbc.Driver"
        jdbc_connection_string => "jdbc:mysql://xxx:3306/dict?characterEncoding=UTF-8"
        jdbc_user => "xxx"
        jdbc_password => "xxx"
        statement => "SELECT location_name_cn FROM dict_location WHERE location_id = 1"
        parameters => { "codeParam" => "location"}
        target => "location"
        add_field => { "location_name" => "%{[location][0][location_name_cn]}" }
    }
    mutate {
        add_field => { "standard_company" => ""}
    }
    ruby {
        code => " puts event.get('location')[0]['location_name_cn']"
    }
    rest {
        request => {
            url => "http://localhost:8080/lbd/lbdId2tbdId"        
            method => "post"
            headers => { "Content-Type" => "application/json" }
            body => { "userId" => "%{company}" } 
        }
        target => "company"
    }

}
output {
    stdout {
        codec => rubydebug{}        
    }
}

and logstash log is

[2019-06-25T14:03:44,930][INFO ][logstash.inputs.jdbc     ] (0.060000s) SELECT TOP 1 j.Id, j.Name AS title, j.Location, f.Name AS company, f.ShortName, j.EmergencyDegree, j.created, r.JobId, r.created FROM Jobs j LEFT JOIN Firms f ON j.FirmId = f.Id LEFT JOIN Recommendations r ON j.id = r.JobId;
地区根类
[2019-06-25T14:03:45,462][WARN ][logstash.filters.rest    ] JSON parsing error {:response=>"", :event=>2019-06-25T06:03:44.981Z %{host} %{message}}
{
     "emergencydegree" => 0,
    "standard_company" => "",
             "created" => 2015-08-08T01:46:40.863Z,
               "title" => "web测试工程师",
           "shortname" => "八爪测试",
                "tags" => [
        [0] "_jsonparsefailure"
    ],
               "jobid" => "a4ee0215-b10b-4eb0-b985-92a7f7ef45bc",
       "location_name" => "\x{B5D8}\x{C7F8}\x{B8F9}\x{C0E0}",
          "@timestamp" => 2019-06-25T06:03:44.981Z,
            "@version" => "1",
            "location" => [
        [0] {
            "location_name_cn" => "地区根类"
        }
    ],
             "company" => "八爪网络测试有限公司",
                  "id" => "a4ee0215-b10b-4eb0-b985-92a7f7ef45bc"
}
[2019-06-25T14:03:47,498][WARN ][logstash.agent           ] stopping pipeline {:id=>"main"}

Q1：
i use add_field => { "location_name" => "%{[location][0][location_name_cn]}" } and result is
"location_name" => "\x{B5D8}\x{C7F8}\x{B8F9}\x{C0E0}"

but i use ruby code puts event.get('location')[0]['location_name_cn'] result is 地区根类" and is correct

Am I using it incorrectly?

Q2:
i use logstash-filter-http and i send requet to my server, my server log is

{"userId":"��צ����������޹�˾"}
{"userId":"��צ����������޹�˾"}
{"userId":"��צ����������޹�˾"}
{"userId":"��צ����������޹�˾"}
{"userId":"��צ����������޹�˾"}

if i send body => { "userId" => "测试" }
my server will be correct!

Am I using it incorrectly?

logstash 5.4.1