spring data elasticsearch多索引查询

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一次查询多个索引数据

es里可以这样写

GET 索引1,索引2,索引3/_search

也可以这样

给索引创建别名，多个索引可以使用一个别名

POST /_aliases
{
"actions": [
{
"add": {
"index": "myindex2",
"alias": "myalias"
}
},{
"add": {
"index": "myindex3",
"alias": "myalias"
}
}
]
}

或者

PUT /myindex2/_alias/myalias

删除别名

POST /_aliases
{
"actions": [
{
"remove": {
"index": "myindex3",
"alias": "my_index_alias"
}
}
]
}

java查询多个索引

SearchQuery searchQuery = new NativeSearchQueryBuilder()
.withIndices("myindex2","myindex4")//可以直接使用别名
.withQuery(queryBuilder)
//.addAggregation(sumBuilder)
.build();
List<Map> map=elasticsearchTemplate.query(searchQuery, response -> {
SearchHits hits = response.getHits();
List<Map> list=new ArrayList<>();
Arrays.stream(hits.getHits()).forEach(h -> {
Map<String, Object> source = h.getSource();
System.out.println(JSONArray.toJSONString(source));
list.add(source);
});
return list;
});