ClassNotFoundException: org.elasticsearch.client.ResponseException because ElasticsearchExceptionTranslator requires old low-level Elasticsearch but it's now optional

[wilkinsona]

The old low-level client is optional, but ElasticsearchExceptionTranslator still has a hard dependency on its org.elasticsearch.client.ResponseException. This results in a failure at runtime:

Caused by: java.lang.NoClassDefFoundError: org/elasticsearch/client/ResponseException
	at org.springframework.data.elasticsearch.client.elc.ElasticsearchExceptionTranslator.checkForConflictException(ElasticsearchExceptionTranslator.java:121)
	at org.springframework.data.elasticsearch.client.elc.ElasticsearchExceptionTranslator.translateExceptionIfPossible(ElasticsearchExceptionTranslator.java:73)
	at org.springframework.data.elasticsearch.client.elc.ElasticsearchExceptionTranslator.translateException(ElasticsearchExceptionTranslator.java:65)
	at org.springframework.data.elasticsearch.client.elc.ChildTemplate.execute(ChildTemplate.java:73)
	at org.springframework.data.elasticsearch.client.elc.IndicesTemplate.doExists(IndicesTemplate.java:179)
	at org.springframework.data.elasticsearch.client.elc.IndicesTemplate.exists(IndicesTemplate.java:171)
	at org.springframework.data.elasticsearch.repository.support.SimpleElasticsearchRepository.createIndexAndMappingIfNeeded(SimpleElasticsearchRepository.java:93)
	at org.springframework.data.elasticsearch.repository.support.SimpleElasticsearchRepository.<init>(SimpleElasticsearchRepository.java:87)
	at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:77)
	at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
	at java.base/java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:500)
	at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:481)
	at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:209)
	... 113 common frames omitted
Caused by: java.lang.ClassNotFoundException: org.elasticsearch.client.ResponseException
	... 127 common frames omitted

I should be able to work around this by temporarily reinstating a dependency on the old client. Longer term, could you please update ElasticsearchExceptionTranslator to only consider translation of org.elasticsearch.client.ResponseException when it's on the classpath.

[sothawo]

thanks for finding this, seems my test program did not need to translate an exception :-). Will have a look this evening