elasticsearch 第四篇(API约定)

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对多个indices进行操作

es中大多resetapi支持请求多个index, 例如”test1,test2,test3”，index也可以使用通配符, 例如”test*“, 还可以使用+,-来包含或移除某个或某类index, 例如”test*,-test1”
支持设置多个的api的请求字符串可设置以下参数:

ignore_unavailable: 是否忽略单个index是否可用(不存在或关闭), true表示忽略, false表示不忽略, 默认为false, 例如查询已经关闭的index:

输入: GET /test1/user,account/_search?ignore_unavailable=false
输出:

{   "error": "IndexClosedException[[test1] closed]",   "status": 403}

输入: GET /test1/user,account/_search?ignore_unavailable=false
输出:

1234567891011121314

{   "took": 1,   "timed_out": false,   "_shards": {      "total": 0,      "successful": 0,      "failed": 0   },   "hits": {      "total": 0,      "max_score": 0,      "hits": []   }}

allow_no_indices: 是否忽略通配符匹配不到index(不存在或关闭)的情况, true表示允许, false表示不允许，默认为true, 例如查询已经关闭的index:

输入: GET /test*/_search?allow_no_indices=false
输出:

{   "error": "IndexMissingException[[test*] missing]",   "status": 404}

输入: GET /test*/_search?allow_no_indices=true

1234567891011121314

{   "took": 1,   "timed_out": false,   "_shards": {      "total": 0,      "successful": 0,      "failed": 0   },   "hits": {      "total": 0,      "max_score": 0,      "hits": []   }}

expand_wildcards: 设置是否扩展通配符到closed的index中，open表示只在匹配并为open的index中查询，closed表示在匹配的所有的index中查询, 默认为closed, 例如查询已经关闭的index
输入: GEt /test*/_search?expand_wildcards=closed
输出:
```
1234
```
```
{   "error": "IndexClosedException[[test1] closed]",   "status": 403}
```

公共参数

format: 表示返回数据的格式, 可选值为yaml和json两种, 例如:
输入: GET /test1/user/_search?format=yaml
输出:

1234567891011121314151617

---took: 23timed_out: false_shards:  total: 5  successful: 5  failed: 0hits:  total: 1  max_score: 1.0  hits:  - _index: "test1"    _type: "user"    _id: "1"    _score: 1.0    _source:      name: "silence"

pretty: 表示在已json格式返回数据时是否以可视化的格式返回, false或未在设置表示不格式化, 否则格式化
human: 表示是否对返回结果进行格式化处理，比如3600(s)显示1h
查询结果过滤
主要使用filter_path参数进行设置

1.在返回结果中我们只关注took, hits.total, hits.hits._id, hits._source, 则我们可以发起如此请求:
输入:GET /test1/user/_search?filter_path=took,hits.total,hits.hits._id,hits.hits._source
输出:

1234567891011121314

{   "took": 1,   "hits": {      "total": 1,      "hits": [         {            "_id": "1",            "_source": {               "name": "silence"            }         }      ]   }}

2.也可以使用统配符进行设置
输入: GET /_nodes/stats?filter_path=nodes.*.*ost*,nodes.*.os.*u
输出:

12345678910111213141516

{   "nodes": {      "9jfW4VeWRta-Uq7Cq7bK34": {         "host": "silence",         "os": {            "cpu": {               "sys": 1,               "user": 1,               "idle": 96,               "usage": 2,               "stolen": 0            }         }      }   }}

3.若层级较多时可使用**进行简化
输入: GET /_nodes/stats?filter_path=nodes.**.*sys*
输出:

12345678910111213141516

{   "nodes": {      "9jfW4VeWRta-Uq7Cq7bK34": {         "os": {            "cpu": {               "sys": 2            }         },         "process": {            "cpu": {               "sys_in_millis": 139106            }         }      }   }}

4.若只需要_source中的某些值，则可以将filter_path和_source参数共同使用
输入: GET /test1/account/_search?filter_path=hits.hits._source&_source=firstname,lastname,gender&size=2
输出:

1234567891011121314151617181920

{   "hits": {      "hits": [         {            "_source": {               "firstname": "Rodriquez",               "gender": "F",               "lastname": "Flores"            }         },         {            "_source": {               "firstname": "Opal",               "gender": "M",               "lastname": "Meadows"            }         }      ]   }}

5.flat_settings用于设置在查询setting时,setting中的key格式, 默认为false:
输入: GET /test1/_settings?flat_settings=true
输出:

1234567891011

{   "test1": {      "settings": {         "index.creation_date": "1442230557598",         "index.uuid": "70bg061IRdKUdDNvgkUBoQ",         "index.version.created": "1060099",         "index.number_of_replicas": "1",         "index.number_of_shards": "5"      }   }}

输入: GET /test1/_settings?flat_settings=false
输出:

123456789101112131415

{   "test1": {      "settings": {         "index": {            "creation_date": "1442230557598",            "number_of_shards": "5",            "uuid": "70bg061IRdKUdDNvgkUBoQ",            "version": {               "created": "1060099"            },            "number_of_replicas": "1"         }      }   }}

请求参数格式
1.boolean: 在es中将”0”, 0, false, “false”, “off”识别为false，其他均按ture处理
2.number
3.time: 可以提交一个以毫秒时间的整数或者以日期标识结尾的字符串，例如”2d”表示2天，支持的格式有: y(year),M(month),w(week),d(day),h(hour),m(minute),s(second)
4.距离: 可以提交一个以米为单位的证书或者以距离表示结尾的字符串，例如”2km”表示2千米，支持的格式有: mi/miles(mile英里), yd/yards(yard码), ft/feet(feet尺), in/inch(inch英寸), km/kilometers(kilometer千米), m/meters(meter米), cm/centimeters(centimeter厘米), mm/millimeters(millimeter毫米), NM/nmi/nauticalmiles(Nautical mile纳米)
5.模糊类型:
a.数字,时间, IP：类似于range -fuzzines<=value<=+fuzzines
b.字符串: 计算编辑距离
返回结果中key的格式为驼峰还是下划线分割, 通过case设置为camelCase则返回驼峰格式，否则为下划线分割形式
jsonp: 可以用jsonp回调的方式调用es api, 需要通过callback设置回调函数名称，并且需要在elasticsearch.yml中配置http.jsonp.enable: true来启用jsonp格式

url访问控制

可以通过代理方式进行es的url访问控制，但是对于multi-search，multi-get和bulk等在请求参数中设置不同的index的情况很难解决.
为防止通过请求体设置index的情况,需要在elasticsearch.yml中设置rest.action.multi.allow_explicit_index:false, 此时es不允许在request body中设置index

如在修改前：
输入:

POST /test1/user3/_bulk?pretty{"index" : {"_index" : "test2", "_type" : "user1", "_id" : 1}}{"name" : "silence1"}{"index" : {"_index" : "test2", "_type" : "user1", "_id" : 2}}{"name" : "silence2"}

输出:

123456789101112131415161718192021222324

{   "took": 225,   "errors": false,   "items": [      {         "index": {            "_index": "test2",            "_type": "user1",            "_id": "1",            "_version": 1,            "status": 201         }      },      {         "index": {            "_index": "test2",            "_type": "user1",            "_id": "2",            "_version": 1,            "status": 201         }      }   ]}

如在修改后(已重启)：
输出:

{   "error": "IllegalArgumentException[explicit index in bulk is not allowed]",   "status": 500}

输入:

POST /test1/user3/_bulk?pretty{"index" : {"_id" : 1}}{"name" : "silence1"}{"index" : {"_id" : 2}}{"name" : "silence2"}

输出:

123456789101112131415161718192021222324

{   "took": 8,   "errors": false,   "items": [      {         "index": {            "_index": "test1",            "_type": "user3",            "_id": "1",            "_version": 1,            "status": 201         }      },      {         "index": {            "_index": "test1",            "_type": "user3",            "_id": "2",            "_version": 1,            "status": 201         }      }   ]}

from:　http://imsilence.github.io/2015/09/16/elasticsearch/elasticsearch_04/

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