Add config prop to enabled/disable Elasticsearch sniffer

Closes gh-47301

Co-Authored-By: Andy Wilkinson <andy.wilkinson@broadcom.com>

Author: philwebb

documentation/spring-boot-docs/src/docs/antora/modules/reference/pages/data/nosql.adoc

@@ -350,6 +350,8 @@ spring:
         delay-after-failure: "30s"
 ----
 
+To disable auto-configuration of the Sniffer, set configprop:spring.elasticsearch.restclient.sniffer.enabled[] to `false`.
+
 
 
 [[data.nosql.elasticsearch.connecting-using-rest.javaapiclient]]

module/spring-boot-elasticsearch/src/main/java/org/springframework/boot/elasticsearch/autoconfigure/ElasticsearchProperties.java

@@ -160,6 +160,11 @@ public Ssl getSsl() {
 
 		public static class Sniffer {
 
+			/**
+			 * Whether the sniffer is enabled.
+			 */
+			private boolean enabled = true;
+
 			/**
 			 * Interval between consecutive ordinary sniff executions.
 			 */
@@ -170,6 +175,14 @@ public static class Sniffer {
 			 */
 			private Duration delayAfterFailure = Duration.ofMinutes(1);
 
+			public boolean isEnabled() {
+				return this.enabled;
+			}
+
+			public void setEnabled(boolean enabled) {
+				this.enabled = enabled;
+			}
+
 			public Duration getInterval() {
 				return this.interval;
 			}

module/spring-boot-elasticsearch/src/main/java/org/springframework/boot/elasticsearch/autoconfigure/ElasticsearchRestClientConfigurations.java

@@ -47,6 +47,7 @@
 import org.springframework.beans.factory.ObjectProvider;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnSingleCandidate;
 import org.springframework.boot.context.properties.PropertyMapper;
 import org.springframework.boot.elasticsearch.autoconfigure.ElasticsearchConnectionDetails.Node;
@@ -138,6 +139,7 @@ Rest5Client elasticsearchRestClient(Rest5ClientBuilder restClientBuilder) {
 	@Configuration(proxyBeanMethods = false)
 	@ConditionalOnClass(Sniffer.class)
 	@ConditionalOnSingleCandidate(Rest5Client.class)
+	@ConditionalOnProperty(name = "spring.elasticsearch.restclient.sniffer.enabled", matchIfMissing = true)
 	static class RestClientSnifferConfiguration {
 
 		@Bean

module/spring-boot-elasticsearch/src/test/java/org/springframework/boot/elasticsearch/autoconfigure/ElasticsearchRestClientAutoConfigurationTests.java

@@ -295,6 +295,12 @@ void configureWhenCustomSnifferShouldBackOff() {
 		});
 	}
 
+	@Test
+	void configureWithSnifferDisabled() {
+		this.contextRunner.withPropertyValues("spring.elasticsearch.restclient.sniffer.enabled=false")
+			.run((context) -> assertThat(context).doesNotHaveBean(Sniffer.class));
+	}
+
 	@Test
 	void definesPropertiesBasedConnectionDetailsByDefault() {
 		this.contextRunner