elasticsearch在查询时始终返回null-result

Question

我试图在Getting Started之后学习弹性搜索。但是在查询时null除了match_all之外总是得到match_all。

当我执行如下所示的curl -XPOST 'localhost:9200/bank/_search?pretty' -d ' { "query": { "match_all": {} } }' | head -20 查询时，它可以正常工作：

  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0{
  "took" : 15,
  "timed_out" : false,
  "_shards" : {
    "total" : 5,
    "successful" : 5,
    "failed" : 0
  },
  "hits" : {
    "total" : 2,
    "max_score" : 1.0,
    "hits" : [ {
      "_index" : "bank",
      "_type" : "acount",
      "_id" : "_buck",
      "_score" : 1.0,
      "_source":{"index":{"_id":"1"}}
{"account_number":1,"balance":39225,"firstname":"Amber","lastname":"Duke","age":32,"gender":"M","address":"880 Holmes Lane","employer":"Pyrami","email":"amberduke@pyrami.com","city":"Brogan","state":"IL"}
{"index":{"_id":"6"}}
{"account_number":6,"balance":5686,"firstname":"Hattie","lastname":"Bond","age":36,"gender":"M","address":"671 Bristol Street","employer":"Netagy","email":"hattiebond@netagy.com","city":"Dante","state":"TN"}
curl: (23) Failed writing body (8282 != 16384)

输出（1）：

match

接下来，我执行filter和其他命令，例如aggr，size，curl -XPOST 'localhost:9200/bank/_search?pretty' -d ' { "query": { "match": {"age": 32} } }' | head -20 ，

  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100   261  100   193  100    68  31535  11111 --:--:-- --:--:-- --:--:-- 38600
{
  "took" : 2,
  "timed_out" : false,
  "_shards" : {
    "total" : 5,
    "successful" : 5,
    "failed" : 0
  },
  "hits" : {
    "total" : 0,
    "max_score" : null,
    "hits" : [ ]
  }
}

输出（2）：

hits.hits = [ ]

为什么输出中的32（2）？根据输出（1），琥珀的年龄是{{1}}，不是吗？