用curl在elasticsearch中查询和查询

curl -XPUT 'localhost:9200/customer/external/1' -d '{ "author": "John","published_from":"2016-08-03" }'
curl -XPUT 'localhost:9200/customer/external/2' -d '{ "author": "Jeanne","published_from":"2016-08-03" }'
curl -XPUT 'localhost:9200/customer/external/3' -d '{ "author": "Jean","published_from":"2016-08-05" }'

我正在尝试使用published_from = 2016-08-03和author = John查询文档.
我试着用这个curl命令做到这一点：

curl -g "localhost:9200/customer/external/_search?pretty&filter_path=hits.hits._source.author&q=+author:John+published_from:2016-08-03"

然而,输出显示珍妮

{
  "hits" : {
    "hits" : [
      {
        "_source" : {
          "author" : "John"
        }
      },{
        "_source" : {
          "author" : "Jeanne"
        }
      }
    ]
  }
}

当我尝试这个curl命令时：

curl "localhost:9200/customer/external/_search?pretty&filter_path=hits.hits._source.author&q=%2Bauthor%3AJohn+%2Bpublished_from%3A2016-08-03"

输出正是我想要的.

{
  "hits" : {
    "hits" : [
      {
        "_source" : {
          "author" : "John"
        }
      }
    ]
  }
}

为什么第一个命令没有按预期工作？