Elasticsearch Client is defaulting to localhost

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I am using spring.data.elasticsearch with Elasticsearch 7.14.1 in my Spring Boot (2.5.4) application.

My application.properties is something like this

spring.elasticsearch.rest.uris=elasticsearch:9200
spring.data.elasticsearch.cluster=elasticsearch:9200
spring.data.elasticsearch.repositories.enabled=true

This works fine as long as the invocation is from localhost, no issues. However, when I try to bring up my Spring Boot container, I see a failure with NoReachableHostException

    reactor.core.Exceptions$ErrorCallbackNotImplemented: org.springframework.data.elasticsearch.client.NoReachableHostException: Host 'localhost:9200' not reachable. Cluster state is offline.
blah-blah-service 
 Caused by: org.springframework.data.elasticsearch.client.NoReachableHostException: Host **'localhost:9200'** not reachable. Cluster state is offline.
blah-blah-service         
 at org.springframework.data.elasticsearch.client.reactive.SingleNodeHostProvider.lambda$lookupActiveHost$3(SingleNodeHostProvider.java:101)

Clearly, my suggestion to use "elasticsearch" host (defined network, that is tested and accessible from within and outside docker containers), hasn't gone well with Spring Data for whatever reason. I have even used

@PropertySource("classpath:mysearch.properties")

in my application to try and coax these properties into the app, but doesn't look like anything works. Is there something I am missing in my Elasticsearch configuration or otherwise?

PS: I have exercised curl http://elasticsearch:9200 from within the container and find no issues

spring-data-elasticsearch elasticsearch spring-boot java
2 Answers

These configurations are Spring Boot specific, Spring Data Elasticsearch does not use them. But as far as I can see, you are configuring the transport client (cluster entry, should not be used anyway) and the imperative REST client, but according to the error message you are using the reactive REST client.

According to the Spring Boot documentation you would need to set spring.data.elasticsearch.client.reactive.endpoints

user_43935650

In the .properties file, I used the below and solved the issue for me;

spring.elasticsearch.rest.uris=http://localhost:<port_number>
spring.data.elasticsearch.client.reactive.endpoints=localhost:<port_number>
user_33328790
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