多索引关联
1 ES多索引关联查询方案汇总
https://www.cnblogs.com/eternityz/p/17051671.html
2 干货 | Elasticsearch多表关联设计指南
https://blog.csdn.net/laoyang360/article/details/88784748
性能优化
1 Java es同时查询多个索引
https://blog.51cto.com/u_16213348/7975375
2 Elasticsearch Terms聚合性能提升10倍
https://blog.csdn.net/wangmaohong0717/article/details/82429278