使用别名查询多个索引的效率？

《Elasticsearch Server》
When working with multiple indices in Elasticsearch, you can sometimes lose track of
them. Imagine a situation where you store logs in your indices. Usually, the amount of
log messages is quite large, and therefore, it is a good solution to have the data divided
somehow. A logical division of such data is obtained by creating a single index for
a single day of logs (if you are interested in an open source solution used to manage
logs, look at the Logstash at http://logstash.net). But after some time, if we keep
all the indices, we will start to have a problem in taking care of all that. An application
needs to take care of all the information, such as which index to send data to, which
to query, and so on. With the help of aliases, we can change this to work with a single
name just as we would use a single index, but we will work with multiple indices.