Elasitc throwing error while connecting from Pivotal Colud foundry

Elastic Stack Elasticsearch
1

We are using java high level rest client to connect to elastic search through spring boot. The spring boot application launches fine from workstation but when we deploy to Pivotal cloud foundry getting the following error intermittently. How to solve this problem?

Elastic search 6.7.2 installed on ubuntu 16.04
Dependency in POM.xml files

    <dependency> 
		<groupId> org.elasticsearch</groupId> 
		<artifactId>elasticsearch</artifactId>  
		<version>6.4.3</version>
	</dependency> 
  	<dependency> 
		<groupId> org.elasticsearch.client</groupId> 
		<artifactId>elasticsearch-rest-high-level-client</artifactId> 
		<version>6.4.3</version> 
	</dependency>
	<dependency> 
		<groupId> org.elasticsearch.client</groupId> 
		<artifactId>elasticsearch-rest-client-sniffer</artifactId> 
		<version>6.4.3</version> 
	</dependency>

Error in PCF logs:

2019-10-28T09:47:50.163-04:00 [APP/PROC/WEB/0] [OUT] 2019-10-28 13:47:50.155 WARN 23 --- [nio-8080-exec-3] s.b.a.e.ElasticsearchRestHealthIndicator : Elasticsearch health check failed
2019-10-28T09:47:50.163-04:00 [APP/PROC/WEB/0] [OUT] java.net.ConnectException: Connection refused
2019-10-28T09:47:50.163-04:00 [APP/PROC/WEB/0] [OUT] at org.elasticsearch.client.RestClient$SyncResponseListener.get(RestClient.java:943) ~[elasticsearch-rest-client-6.4.3.jar!/:6.4.3]
2019-10-28T09:47:50.163-04:00 [APP/PROC/WEB/0] [OUT] at org.elasticsearch.client.RestClient.performRequest(RestClient.java:227) ~[elasticsearch-rest-client-6.4.3.jar!/:6.4.3]
2019-10-28T09:47:50.163-04:00 [APP/PROC/WEB/0] [OUT] at org.springframework.boot.actuate.elasticsearch.ElasticsearchRestHealthIndicator.doHealthCheck(ElasticsearchRestHealthIndicator.java:58) ~[spring-boot-actuator-2.1.1.RELEASE.jar!/:2.1.1.RELEASE]
2019-10-28T09:47:50.163-04:00 [APP/PROC/WEB/0] [OUT] at org.springframework.boot.actuate.health.AbstractHealthIndicator.health(AbstractHealthIndicator.java:84) ~[spring-boot-actuator-2.1.1.RELEASE.jar!/:2.1.1.RELEASE]
2019-10-28T09:47:50.163-04:00 [APP/PROC/WEB/0] [OUT] at org.springframework.boot.actuate.health.CompositeHealthIndicator.health(CompositeHealthIndicator.java:98) [spring-boot-actuator-2.1.1.RELEASE.jar!/:2.1.1.RELEASE]
2019-10-28T09:47:50.163-04:00 [APP/PROC/WEB/0] [OUT] at org.springframework.boot.actuate.health.HealthEndpoint.health(HealthEndpoint.java:50) [spring-boot-actuator-2.1.1.RELEASE.jar!/:2.1.1.RELEASE]
2019-10-28T09:47:50.163-04:00 [APP/PROC/WEB/0] [OUT] at org.springframework.boot.actuate.health.HealthEndpointWebExtension.getHealth(HealthEndpointWebExtension.java:75) [spring-boot-actuator-2.1.1.RELEASE.jar!/:2.1.1.RELEASE]
2019-10-28T09:47:50.164-04:00 [APP/PROC/WEB/0] [OUT] Caused by: java.net.ConnectException: Connection refused
2019-10-28T09:47:50.164-04:00 [APP/PROC/WEB/0] [OUT] at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method) ~[na:1.8.0_212]
2019-10-28T09:47:50.164-04:00 [APP/PROC/WEB/0] [OUT] at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:717) ~[na:1.8.0_212]
2019-10-28T09:47:50.164-04:00 [APP/PROC/WEB/0] [OUT] at org.apache.http.impl.nio.reactor.DefaultConnectingIOReactor.processEvent(DefaultConnectingIOReactor.java:171) ~[httpcore-nio-4.4.10.jar!/:4.4.10]
2019-10-28T09:47:50.164-04:00 [APP/PROC/WEB/0] [OUT] at org.apache.http.impl.nio.reactor.DefaultConnectingIOReactor.processEvents(DefaultConnectingIOReactor.java:145) ~[httpcore-nio-4.4.10.jar!/:4.4.10]
2019-10-28T09:47:50.164-04:00 [APP/PROC/WEB/0] [OUT] at org.apache.http.impl.nio.reactor.AbstractMultiworkerIOReactor.execute(AbstractMultiworkerIOReactor.java:348) ~[httpcore-nio-4.4.10.jar!/:4.4.10]
2019-10-28T09:47:50.164-04:00 [APP/PROC/WEB/0] [OUT] at org.apache.http.impl.nio.conn.PoolingNHttpClientConnectionManager.execute(PoolingNHttpClientConnectionManager.java:221) ~[httpasyncclient-4.1.4.jar!/:4.1.4]
2019-10-28T09:47:50.164-04:00 [APP/PROC/WEB/0] [OUT] at org.apache.http.impl.nio.client.CloseableHttpAsyncClientBase$1.run(CloseableHttpAsyncClientBase.java:64) ~[httpasyncclient-4.1.4.jar!/:4.1.4]
2019-10-28T09:47:50.164-04:00 [APP/PROC/WEB/0] [OUT] ... 1 common frames omitted
2

java.net.ConnectException: Connection refused seems to say that you can't reach elasticsearch from the machine where your spring application is running.

Did you try to run a simple

curl ip:9200

From the same machine?

3

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