Elasticsearch常用操作

新建index

PUT /index_demo{ "settings": { "number_of_shards": 1, "number_of_replicas": 0 }, "mappings": { "properties": { "name":{ "type": "text", "analyzer": "ik_max_word" } } }}

修改索引

PUT /index_demo/_settings{ "number_of_replicas": 1}

删除索引

DELETe /index_demoDELETE /index_1,index_2DELETE /index_demo*DELETE /_all

查询索引

GET /index_demo/_settingsGET /index_demo/_mapping

新增/修改document

GET /index_demo/_searchPOST index_demo/_doc/001{ "title": "好评不错", "tag": "精彩", "content": "这里必须有一些内容，来表示这个评论是好评", "score": 90, "time": 1596441469000}POST index_demo/_doc{ "title": "好评不错", "tag": "精彩", "content": "这里必须有一些内容，来表示这个评论是好评", "score": 90, "time": 1596441469000}PUT index_demo/_doc/001{ "name": "好评不错"}

语法, 使用POST或者PUT都可以，存在则更新否则创建；

区别在于没有加ID值时（没有ID会自动生成），只能用POST表示创建；
需要注意的是使用PUT做更新时，其实是直接覆盖，因此需要带上所有的数据；

查询数据

# 查询所有GET /索引名称/_search# 根据ID查询GET /索引名称/_doc/数据的id值

删除数据

#删除使用的逻辑删除，之后会统一进行物理删除DELETE /索引名称/_doc/数据的id值

query string search

GET /index_demo/_search?q=title:好评&_source=title,tag,time&sort=score:desc&from=0&size=1

注意：

排序的字段必须是设置  fielddata=true,否则分词不能用于排序

query DSL

GET /index_demo/_search{"query": {"bool": {"must": [{"match": {"tag": "精彩"}}],"filter": [{"range": {"score": {"gt": 30}}}]}}, "_source": ["name", "title","tag","content","score"], "sort": [ { "score": { "order": "desc" } } ], "from": 0, "size": 20}

注意

filter中的过滤字段不参与评分

多字段+高亮+标准分词

{"query": {"multi_match": {"query": "精彩 好评 内容","fields": ["title", "content"],"analyzer": "standard"}},"_source": ["name", "title", "tag", "content", "score"],"sort": [{"score": {"order": "desc"}}],"highlight": {"pre_tags": [""],"post_tags": [""],"fields": {"content": {},"title": {}}},"from": 0,"size": 20}