elasticsearch bulkApi是什么？和普通的CURD区别在哪里？

1.可以批量对多个索引进行增加或者删除等操作，减少网络请求次数，可以显著的提高索引的速度。

2.CURD只能对单条数据进行操作，如果是数据导入的情况下QPS会特别高。

3.多个API操作之间的结果互不影响。

4.注意:bulk操作不能进行代码换行

使用Bulk API 实现批量操作4个API

POST _bulk

{action1:{metadata1}}

{requestbody1}

{action2:{metadata2}}

{requestbody2}

action(行为)

desc(描述)

create

文档不存在时，创建

update

更新文档

index

创建新文档，或者替换已经有的文档

delete

删除一个文档

举例

POST _bulk

{"index":{"_index":"member","_id":1}}

{"doc":{"id":1,"name":"bulk index","age":1}}

{"create":{"_index":"member","_id":999}}

{"doc":{"id":999,"name":"bulk index","age":1}}

{"delete":{"_index":"member","_id":"nXboAHcBlmI4Ioi720Td"}}

{"update":{"_index":"member","_id":999}}

{"doc":{"name":"bulk index name 999"}}

{

"took" : 171,

"errors" : false,

"items" : [

{

"index" : {

"_index" : "member",

"_type" : "_doc",

"_id" : "1",

"_version" : 11,

"result" : "updated",

"_shards" : {

"total" : 2,

"successful" : 2,

"failed" : 0

},

"_seq_no" : 25,

"_primary_term" : 1,

"status" : 200

}

},

{

"create" : {

"_index" : "member",

"_type" : "_doc",

"_id" : "999",

"_version" : 1,

"result" : "created",

"_shards" : {

"total" : 2,

"successful" : 2,

"failed" : 0

},

"_seq_no" : 26,

"_primary_term" : 1,

"status" : 201

}

},

{

"delete" : {

"_index" : "member",

"_type" : "_doc",

"_id" : "nXboAHcBlmI4Ioi720Td",

"_version" : 2,

"result" : "deleted",

"_shards" : {

"total" : 2,

"successful" : 2,

"failed" : 0

},

"_seq_no" : 27,

"_primary_term" : 1,

"status" : 200

}

},

{

"update" : {

"_index" : "member",

"_type" : "_doc",

"_id" : "999",

"_version" : 2,

"result" : "updated",

"_shards" : {

"total" : 2,

"successful" : 2,

"failed" : 0

},

"_seq_no" : 28,

"_primary_term" : 1,

"status" : 200

}

}

]

}