bulk 是 elasticsearch 提供的一种批量增删改的操作API。

bulk 对 JSON串 有着严格的要求。每个JSON串 不能换行 ，只能放在同一行，同时， 相邻的JSON串之间必须要有换行 （Linux下是\n；Window下是\r\n）。bulk的每个操作必须要 一对JSON串 （delete语法除外）。

action必须是以下几种：

行为	解释
create	如果文档不存在就创建，但如果文档存在就返回错误 包含 。POSt和PUT 两种操作
index	如果文档不存在就创建，如果文档存在就更新，版本_version 会加1
update	更新一个文档，如果文档不存在就返回错误
delete	删除一个文档，如果要删除的文档id不存在，就返回错误

其实可以看得出来 index 是比较常用的。 bulk 请求不是原子操作，它们不能实现事务。每个请求操作时分开的，所以每个请求的成功与否不干扰其它操作。

Bulk一次最大处理多少数据量？
Bulk会把将要处理的数据载入内存中，所以数据量是有限制的，最佳的数据量不是一个确定的数值，它取决于你的硬件，你的文档大小以及复杂性，你的索引以及搜索的负载。
一般建议是1000-5000个文档，大小建议是5-15M，默认不能超过100M，可以在es的配置文件（即$ES_HOME下的config下的elasticsearch.yml）中

# bulk批量的混合操作，一般不推荐这种使用，项目中也用的极少。
PUT /_bulk
{ "create" : { "_index" : "ad", "_id" : "6" }}
{ "doc" : {"name" : "bulk"}}
{ "index" : { "_index" : "ad", "_id" : "6" }}
{ "doc" : {"name" : "bulk"}}
{ "delete":{ "_index" : "ad", "_id" : "1"}}
{ "update":{ "_index" : "ad", "_id" : "3"}}
{ "doc" : {"name" : "huawei p20"}}# 输出结果
{
"took" : 77,
# 如果任意一个文档出错，这里返回true,
"errors" : true,
# items数组，它罗列了每一个请求的结果，结果的顺序与我们请求的顺序相同
"items" : [
{# create这个文档已经存在，所以异常"create":{"_index":"ad","_type":"_doc","_id":"6","status":409,"error":{"type":"version_conflict_engine_exception","reason":"[6]: version conflict, document already exists (current version [1])","index_uuid":"90zLKRHyT02kyN148mQpqg","shard":"0","index":"ad"}}
},
# index这个文档已经存在，会覆盖
{"index":{"_index":"ad","_type":"_doc","_id":"6","_version":2,"result":"updated","_shards":{"total":2,"successful":1,"failed":0},"_seq_no":11,"_primary_term":3,"status":200}
},
{"delete":{"_index":"ad","_type":"_doc","_id":"1","_version":2,"result":"deleted","_shards":{"total":2,"successful":1,"failed":0},"_seq_no":12,"_primary_term":3,"status":200}
},
{"update":{"_index":"ad","_type":"_doc","_id":"3","_version":2,"result":"updated","_shards":{"total":2,"successful":1,"failed":0},"_seq_no":13,"_primary_term":3,"status":200}
}
]
}
测试数据准备# 测试数据准备
PUT example
PUT example/_mapping
{"mapping":{"id":{"type":"long"},"name":{"type":"text"},"counter":{"type":"integer"},"tags":{"type":"text"}}
}
批量插入# 批量插入
POST /example/_bulk
{"index": {"_id": 1}}
{"id":1, "name":"admin", "counter":10, "tags":["red", "black"]}
{"index": {"_id": 2}}
{"id":2, "name":"张三", "counter":20, "tags":["green", "purple"]}
{"index": {"_id": 3}}
{"id":3, "name":"李四", "counter":30, "tags":["red", "blue"]}
{"index": {"_id": 4}}
{"id":4, "name":"tom", "counter":40, "tags":["orange"]}# 输出结果
{"took":7,"errors":false,"items":[{"index":{"_index":"example","_type":"_doc","_id":"1","_version":1,"result":"created","_shards":{"total":2,"successful":1,"failed":0},"_seq_no":0,"_primary_term":1,"status":201}},{"index":{"_index":"example","_type":"_doc","_id":"2","_version":1,"result":"created","_shards":{"total":2,"successful":1,"failed":0},"_seq_no":1,"_primary_term":1,"status":201}},{"index":{"_index":"example","_type":"_doc","_id":"3","_version":1,"result":"created","_shards":{"total":2,"successful":1,"failed":0},"_seq_no":2,"_primary_term":1,"status":201}},{"index":{"_index":"example","_type":"_doc","_id":"4","_version":1,"result":"created","_shards":{"total":2,"successful":1,"failed":0},"_seq_no":3,"_primary_term":1,"status":201}}]
}批量修改# 批量修改
POST /example/_bulk
{"update": {"_id": 1}}
{"doc": {"id":1, "name": "admin-02", "counter":11}}
{"update": {"_id": 2}}
{"script":{"lang":"painless","source":"ctx._source.counter += params.num","params":
{"num":2}}}
{"update":{"_id": 3}}
{"doc": {"name": "test3333name", "counter": 999}}
{"update":{"_id": 4}}
{"doc": {"name": "test444name", "counter": 888}, "doc_as_upsert" : true}# 输出结果
{"took":149,"errors":false,"items":[{"update":{"_index":"example","_type":"_doc","_id":"1","_version":2,"result":"updated","_shards":{"total":2,"successful":1,"failed":0},"_seq_no":4,"_primary_term":1,"status":200}},{"update":{"_index":"example","_type":"_doc","_id":"2","_version":2,"result":"updated","_shards":{"total":2,"successful":1,"failed":0},"_seq_no":5,"_primary_term":1,"status":200}},{"update":{"_index":"example","_type":"_doc","_id":"3","_version":2,"result":"updated","_shards":{"total":2,"successful":1,"failed":0},"_seq_no":6,"_primary_term":1,"status":200}},{"update":{"_index":"example","_type":"_doc","_id":"4","_version":2,"result":"updated","_shards":{"total":2,"successful":1,"failed":0},"_seq_no":7,"_primary_term":1,"status":200}}]
}
批量删除# 批量删除
POST /example/_bulk
{"delete": {"_id": 1}}
{"delete": {"_id": 2}}
{"delete": {"_id": 3}}
{"delete": {"_id": 4}}# 输出结果
{"took":7,"errors":false,"items":[{"delete":{"_index":"example","_type":"_doc","_id":"1","_version":3,"result":"deleted","_shards":{"total":2,"successful":1,"failed":0},"_seq_no":8,"_primary_term":1,"status":200}},{"delete":{"_index":"example","_type":"_doc","_id":"2","_version":3,"result":"deleted","_shards":{"total":2,"successful":1,"failed":0},"_seq_no":9,"_primary_term":1,"status":200}},{"delete":{"_index":"example","_type":"_doc","_id":"3","_version":3,"result":"deleted","_shards":{"total":2,"successful":1,"failed":0},"_seq_no":10,"_primary_term":1,"status":200}},{"delete":{"_index":"example","_type":"_doc","_id":"4","_version":3,"result":"deleted","_shards":{"total":2,"successful":1,"failed":0},"_seq_no":11,"_primary_term":1,"status":200}}]
}

另外在定义存储数据的时候，不预先定义mapping ES 也可以存储数据

数据在存放第一个数据的时候数据类型已经确定下来了