Elasticsearch，为什么添加的Element总是null

Question

我有一个 Elasticsearch-DB，想向数组中添加元素（字符串）。根据这里的讨论 https://discuss.elastic.co/t/append-to-existing-field/16423/2 我建立了一个玩具模型。我初始化：

curl -XPOST "http://localhost:9200/t/t/1/" -d' 
{ 
"hobbies" : ["a", "b"] 
}'

并使用

更新数组

curl -XPOST "http://localhost:9200/t/t/1/_update" -d' 
{ 
"script" : "ctx._source.hobbies.add(params.hobby)", 
"params" : { 
"hobby" : "c" 
} 
}'

不幸的是，更新后的结果总是 "null" 而不是 "c":

curl -XGET 'http://localhost:9200/_search?q=_id:"1"&pretty'

{
  "took" : 29,
  "timed_out" : false,
  "_shards" : {
    "total" : 20,
    "successful" : 20,
    "failed" : 0
  },
  "hits" : {
    "total" : 1,
    "max_score" : 1.0,
    "hits" : [
      {
        "_index" : "t",
        "_type" : "t",
        "_id" : "1",
        "_score" : 1.0,
        "_source" : {
          "hobbies" : [
            "a",
            "b",
            null,
            null,
            null
          ]
        }
      }
    ]
  }
}

我做错了什么？

Answer 1

你的script结构不正确，应该是这样的：

curl -XPOST "http://localhost:9200/t/t/1/_update" -d' 
{ 
   "script" : {
      "inline": "ctx._source.hobbies.add(params.hobby)", 
      "params" : { 
         "hobby" : "c" 
      } 
   }
}'

Elasticsearch，为什么添加的Element总是null

Elasticsearch, why is added Element always null

elasticsearch

elasticsearch-painless