===== Connecting to Elasticsearch using RestClient
If you have `elasticsearch-rest-client` on the classpath, Spring Boot will auto-configure and register a `RestClient` bean.
If you have `elasticsearch-rest-high-level-client` on the classpath a `RestHighLevelClient` bean will be registered as well.
If you have `elasticsearch-rest-high-level-client` on the classpath a `RestHighLevelClient` bean will be auto-configured as well.
Following Elasticsearch's deprecation of `RestHighLevelClient`, its auto-configuration is deprecated and will be removed in a future release.
In addition to the properties described previously, to fine-tune the `RestClient` and `RestHighLevelClient`, you can register an arbitrary number of beans that implement `RestClientBuilderCustomizer` for more advanced customizations.
To take full control over the clients' configuration, define a `RestClientBuilder` bean.