When I search in Elasticsearch, Elasticsearch send RESTAPI to original db?

Or Elasticsearch have orginal data?

I find Elasticsearch have indexing data. But I can't certain Elasticsearch have original data.

CodePudding user response：

Elasticsearch is a database itself, so if you want some external data source to be in Elasticsearch (e.g: SQL Database) you need to index the data into Elasticsearch first, and then search against that data.

So no, the REST Api will not query against the original DB but against the data you have in Elasticsearch.

You can read more about the process here:

https://www.elastic.co/guide/en/cloud/current/ec-getting-started-search-use-cases-db-logstash.html