elasticsearch详解(四)——elasticsearch数据的基本操作

和elasticsearch交互有两个方式，一种是http的方式，另一种是es的java客户端用tcp，用java代码交互，这也是前面我们看到的elasticsearch会暴漏出两个9200httpserver、9300tcpserver。

http的方式最为简单且常用，这里列举一些es常用的数据操作rest接口。

这里http的调试客户端用postman,一个功能强大的http调试客户端。
github地址：https://github.com/postmanlabs/newman
官网地址：https://www.getpostman.com/
下载后打开，看一下应该都会用的

1.集群的常用操作

1.1集群的健康

GET /_cat/health?v

epoch      timestamp cluster       status node.total node.data shards pri relo init unassign pending_tasks max_task_wait_time active_shards_percent1475247709 17:01:49  elasticsearch green           1         1      0   0    0    0        0             0                  -                100.0%

1.2集群所有的节点

GET /_cat/nodes?v

ip           heap.percent ram.percent cpu load_1m load_5m load_15m node.role master name192.168.2.12           21          68   0    0.03    0.04     0.05 mdi       -      j29ev7V192.168.2.11           22          77  11    2.33    2.47     2.48 mdi       *      HXd0iop

1.3 集群所有的索引

GET /_cat/indices?v

health status index   uuid                   pri rep docs.count docs.deleted store.size pri.store.sizegreen  open   fdsds   t4wSTgd8TTaNB3V-AzoHnw   5   1          0            0      1.8kb           955bgreen  open   .kibana tqFB5-9XRBOgjdN9-_LukA   1   1          3            0     31.8kb         15.9kbgreen  open   test    j5QAMePIQOCqQSgA6ubbUw   5   1          0            0      1.8kb           955b

以上api的规则可以看到都是/_cat/xxx，这是cat api的规则，更多cat api查看这里
https://www.elastic.co/guide/en/elasticsearch/reference/5.6/cat.html

2.索引的基本操作

2.1创建索引

PUT /testindex?pretty

pretty参数是将返回结果格式化的

{    "acknowledged": true,    "shards_acknowledged": true,    "index": "testindex"}

查看索引信息

GET /testindex?pretty

{    "testindex": {        "aliases": {},        "mappings": {},        "settings": {            "index": {                "creation_date": "1511149556373",                "number_of_shards": "5",                "number_of_replicas": "1",                "uuid": "ASzur3xMTY6SL_IU6pLEyw",                "version": {                    "created": "5060499"                },                "provided_name": "testindex"            }        }    }}

2.2索引数据插入

PUT /testindex/testtype/1?pretty{    "name":"test",    "age":20}

{    "_index": "testindex",    "_type": "testtype",    "_id": "1",    "_version": 1,    "result": "created",    "_shards": {        "total": 2,        "successful": 2,        "failed": 0    },    "created": true}

查看插入的数据

GET /testindex/testtype/1?pretty

{    "_index": "testindex",    "_type": "testtype",    "_id": "1",    "_version": 1,    "found": true,    "_source": {        "name": "test",        "age": 20    }}

2.3删除索引

DELETE /testindex?pretty

{    "acknowledged": true}

3.数据的基本操作

3.1 插入数据

2.2已经说明了插入数据的api
语法为:PUT /[index]/[type]/[id] +json数据

3.2 修改数据

语法为：POST /[index]/[type]/[id]+更新的json数据

POST /testindex/testtype/1?pretty{    "name":"test1",    "age":20}

{    "_index": "testindex",    "_type": "testtype",    "_id": "1",    "_version": 2,    "result": "updated",    "_shards": {        "total": 2,        "successful": 2,        "failed": 0    },    "created": false}

3.3 删除数据

语法为：DELETE /[index]/[type]/[id]

DELETE /testindex/testtype/1

{    "found": true,    "_index": "testindex",    "_type": "testtype",    "_id": "1",    "_version": 4,    "result": "deleted",    "_shards": {        "total": 2,        "successful": 2,        "failed": 0    }}

以上是集群的基本操作，用作熟悉elasticsearch，配合head插件来了解elasticsearch更容易。
更多api请访问官网
https://www.elastic.co/guide/en/elasticsearch/reference/5.6/index.html
document apis，search apis，aggregations，indices apis，cat apis，cluster apis等