1、bulk语法

  1. POST /_bulk
  2. { "delete": { "_index": "shop", "_id": "2" }} 
  3. { "create": { "_index": "shop", "_id": "3" }}
  4. { "name" : "vivo 20", "price" : "4890", "system" : "android9", "CPU" : "xiaolong 890" }
  5. { "index":  { "_index": "shop", "_id": "1" }}
  6. { "name" : "iphone 12", "price" : "14890", "system" : "iOS 18", "CPU" : "xiaolong 990" }
  7. { "update": { "_index": "shop", "_id": "1"} }
  8. { "doc" : {"price" : "12890"} }

结果如下：

{
  "took" : 69,
  "errors" : false,
  "items" : [
    {
      "delete" : {
        "_index" : "shop",
        "_type" : "_doc",
        "_id" : "2",
        "_version" : 3,
        "result" : "deleted",
        "_shards" : {
          "total" : 2,
          "successful" : 1,
          "failed" : 0
        },
        "_seq_no" : 3,
        "_primary_term" : 3,
        "status" : 200
      }
    },
    {
      "create" : {
        "_index" : "shop",
        "_type" : "_doc",
        "_id" : "3",
        "_version" : 1,
        "result" : "created",
        "_shards" : {
          "total" : 2,
          "successful" : 1,
          "failed" : 0
        },
        "_seq_no" : 4,
        "_primary_term" : 3,
        "status" : 201
      }
    },
    {
      "index" : {
        "_index" : "shop",
        "_type" : "_doc",
        "_id" : "1",
        "_version" : 2,
        "result" : "updated",
        "_shards" : {
          "total" : 2,
          "successful" : 1,
          "failed" : 0
        },
        "_seq_no" : 5,
        "_primary_term" : 3,
        "status" : 200
      }
    },
    {
      "update" : {
        "_index" : "shop",
        "_type" : "_doc",
        "_id" : "1",
        "_version" : 3,
        "result" : "updated",
        "_shards" : {
          "total" : 2,
          "successful" : 1,
          "failed" : 0
        },
        "_seq_no" : 6,
        "_primary_term" : 3,
        "status" : 200
      }
    }
  ]
}

每一个操作要两个json串，语法如下：

{"action": {"metadata"}}
{"data"}

举例，比如你现在要创建一个文档，放bulk里面，看起来会是这样子的：

{"index": {"_index": "test_index", "_type", "test_type", "_id": "1"}}
{"test_field1": "test1", "test_field2": "test2"}

有哪些类型的操作可以执行呢？
（1）delete：删除一个文档，只要1个json串就可以了
（2）create：PUT /index/_create/id/，强制创建
（3）index：普通的put操作，可以是创建文档，也可以是全量替换文档
（4）update：执行的partial update操作
bulk api 对json的语法，有严格的要求，每个json串不能换行，只能放一行，同时一个json串和一个json串之间，必须有一个换行
bulk操作中，任意一个操作失败，是不会影响其他的操作的，但是在返回结果里，会告诉你异常日志

POST /shop/_doc/_bulk
{ "delete": { "_id": "3" }} 
{ "create": { "_id": "12" }}
{ "test_field":    "test12" }
{ "index":  { }}
{ "test_field":    "auto-generate id test" }
{ "index":  { "_id": "2" }}
{ "test_field":    "replaced test2" }
{ "update": { "_id": "1", "_retry_on_conflict" : 3} }
{ "doc" : {"test_field2" : "bulk test1"} }

2、bulk size最佳大小

bulk request会加载到内存里，如果太大的话，性能反而会下降，因此需要反复尝试一个最佳的 bulk size。一般从 1000~5000 条数据开始,尝试逐渐增加。 另外,如果看大小的话，最好是在5~15MB之间。