Add support for Elasticsearch sniffer

Closes gh-24174

spring-boot-project/spring-boot-docs/src/docs/asciidoc/spring-boot-features.adoc

@@ -4983,6 +4983,19 @@ To take full control over the registration, define a `RestClientBuilder` bean.
 
 TIP: If your application needs access to a "Low Level" `RestClient`, you can get it by calling `client.getLowLevelClient()` on the auto-configured `RestHighLevelClient`.
 
+Additionally, if `elasticsearch-rest-client-sniffer` is on the classpath, a `Sniffer` is auto-configured to automatically discover nodes from a running Elasticsearch cluster and set them to the `RestHighLevelClient` bean.
+You can further tune how `Sniffer` is configured, as shown in the following example:
+
+[source,yaml,indent=0,configprops,configblocks]
+----
+	spring:
+	  elasticsearch:
+	    rest:
+          sniffer:
+            interval: 10m
+            delay-after-failure: 30s
+----
+
 
 
 [[boot-features-connecting-to-elasticsearch-reactive-rest]]