elasticsearch 映射

映射

查询mapping映射关系

GET /megacorp/_mapping/employee

测试分词器

GET /_analyze
{
  "analyzer": "standard",
  "text": "Text to analyze"
}

分词器

1. 标准分词器：先通过空白或者标点符号进行分词，然后转换为小写进行索引存储 standard
2. 空白分词器：通过空格进行词语切割，whitespace
3. 英文分词器：english

字符串索引类型

1. no: 无索引，该字段不能被检索
2. anlayzed: 全文检索
3. not_analyzed 不进行分词参与全文检索，只支持精确匹配

创建映射

{
  "mappings": {
    "tweet" : {
      "properties" : {
        "tweet" : {
          "type" :    "string",
          "analyzer": "english"
        },
        "date" : {
          "type" :   "date"
        },
        "name" : {
          "type" :   "string"
        },
        "user_id" : {
          "type" :   "long"
        }
      }
    }
  }
}

添加新域的映射

PUT /gb/_mapping/tweet
{
  "properties" : {
    "tag" : {
      "type" :    "string",
      "index":    "not_analyzed"
    }
  }
}

测试分词器

GET /gb/_analyze
{
"field":"tag"
"text":"hello world"
}

索引部分

索引创建

PUT /my_index

{
"settings": {...any settings...},
"type_one": {...mappings...},
"type_two": {...mappings...}
}

GET /my_index
{
"my_index": {
"aliases": {},
"mappings": {},
"settings": {
"index": {
"creation_date": "1532185148306",
"number_of_shards": "5",
"number_of_replicas": "1",
"uuid": "rttbjijgTM2vvySvkyXxLA",
"version": {
"created": "6030199"
},-
"provided_name": "my_index"
}-
}-
}-
}

索引删除

DELETE /my_index
DELETE /index1,index2
DELETE /index_*
DELETE /_all
DELETE /*

索引配置的修改

PUT /my_temp_index/_settings
{
    "number_of_replicas": 1 //副本数设置修改为1
}

######设置不存储_source字段

PUT /my_index
{
"mappings":{
"my_type":{
"_source":{
"enable":false
}
}
}
}

不开启_all字段

PUT /my_index/my_type/_mapping
{
    "my_type": {
        "_all": { "enabled": false }
    }
}

新字段时处理策略
设置类型的dynamic字段属性：

取值	含义
true	遇到新字段时自动识别
false	忽略掉新字段
strict	遇到新字段抛异常StrictDynamicMappingException

PUT http://localhost:9201/liujianhui/my_type/_mapping
{
        "my_type": {
            "dynamic":"strict"
    }
}

GET /liujianhui/my_type/_mapping
{
"liujianhui": {
"mappings": {
"my_type": {
"dynamic": "strict",
"_source": {
"enabled": false
},-
"properties": {
"hello": {
"type": "text",
"fields": {
"keyword": {
"type": "keyword",
"ignore_above": 256
}-
}-
},-
"my_type": {
"properties": {
"dynamic": {
"type": "text",
"fields": {
"keyword": {
"type": "keyword",
"ignore_above": 256
}-
}-
}-
}-
}-
}-
}-
}-
}-
}

dynamic字段支持动态更新配置，false字段也会被保留在_source中，只是不支持索引，内容还是会保持在json体中

索引别名

POST /_aliases

{
    "actions": [{
            "add": {
                "index": "liujianhui",
                "alias": "my_index"
            }
        },
        {
            "add": {
                "index": "megacorp",
                "alias": "my_index"
            }
        }
    ]
}

有哪些索引的别名叫做my_index
GET /*/_alias/my_index

索引拥有哪些别名
GET /megacorp/_alias/*

只查询指定分片或者某几个分片
http://localhost:9201/megacorp/employee/_search?preference=_shards:0,1
取值：_primary, _primary_first, _local, _only_node:xyz, _prefer_node:xyz

更新

设置索引的更新时间，这一段时间内会造成数据丢失

PUT /blogs
{
"settings":{
"refresh_interval": "30s"
}
}

PUT /blogs/_settings
{
"refresh_interval":"1s"
}

关闭刷新
PUT /blogs/_settigs
{
"refresh_interval":"1s"
}

PUT /my_index/_settings
{
    "index.translog.durability": "async",
    "index.translog.sync_interval": "5s"
}
"index.translog.durability": "request" 同步请求

合并段请求
POST /logstash-2014-10/_optimize?max_num_segments=1