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
}
}
]
}