做排名的网站哪个好/汕头网站推广

简介：⼿把⼿教你es之如何重建索引

背景

Elasticsearch是⼀个实时的分布式搜索引擎，为⽤户提供搜索服务，当我们决定存储某种数据时，在创建索引的时候需要将数据结构完整确定下来，于此同时索引的设定和很多固定配置将不能改变。当需要改变数据结构时，就需要重新建⽴索引，为此，Elastic团队提供了很多辅助⼯具帮助开发⼈员进⾏重建索引。

步骤

• nba取⼀个别名nba_latest, nba_latest作为对外使⽤
• 新增⼀个索引nba_20220101，结构复制于nba索引，根据业务要求修改字段
• 将nba数据同步到nba_20220101
• 给nba_20220101添加别名nba_latest，删除nba别名nba_latest
• 删除nba索引

我们对外提供访问nba索引时使⽤的是nba_latest别名

新增⼀个索引(⽐如修改字段类型，jerseyNo改成keyword类型)

PUT /nba_20220101
{"mappings": {"properties": {"age": {"type": "integer"},"birthDay": {"type": "date"},"birthDayStr": {"type": "keyword"},"code": {"type": "text"},"country": {"type": "keyword"},"countryEn": {"type": "keyword"},"displayAffiliation": {"type": "text"},"displayName": {"type": "text"},"displayNameEn": {"type": "text"},"draft": {"type": "long"},"heightValue": {"type": "float"},"jerseyNo": {"type": "keyword"},"playYear": {"type": "long"},"playerId": {"type": "keyword"},"position": {"type": "text"},"schoolType": {"type": "text"},"teamCity": {"type": "text"},"teamCityEn": {"type": "text"},"teamConference": {"type": "keyword"},"teamConferenceEn": {"type": "keyword"},"teamName": {"type": "keyword"},"teamNameEn": {"type": "keyword"},"weight": {"type": "text"}}}
}

将旧索引数据copy到新索引

• 同步等待，接⼝将会在 reindex 结束后返回

POST /_reindex
{"source": {"index": "nba"},"dest": {"index": "nba_20220101"}
}

• 异步执⾏，如果 reindex 时间过⻓，建议加上 wait_for_completion=false 的参数条件，这样 reindex 将直接返回 taskId

POST /_reindex?wait_for_completion=false
{"source": {"index": "nba"},"dest": {"index": "nba_20220101"}
}

替换别名

POST /_aliases
{"actions": [{"add": {"index": "nba_20220101","alias": "nba_latest"}},{"remove": {"index": "nba","alias": "nba_latest"}}]
}

删除旧索引

DELETE /nba

通过别名访问新索引

POST /nba_latest/_search
{"query": {"match": {"displayNameEn": "james"}}
}