spring-data-elasticsearch latest version throws NullPointer exception with Elasticsearch 8.1 version - spring-data-elasticsearch

Question

Planning to use elasticsearch 8.1 version and use 'org.springframework.boot:spring-boot-starter-data-elasticsearch' in
our project.
Repository.save() throws following exception.
java.lang.NullPointerException: null
at java.base/java.util.Objects.requireNonNull(Objects.java:221)
at org.elasticsearch.action.DocWriteResponse.(DocWriteResponse.java:116)
at org.elasticsearch.action.index.IndexResponse.(IndexResponse.java:43)
The same code with Elasticsearch 7.15.2 works fine.
I see the supported matrix here https://docs.spring.io/spring-data/elasticsearch/docs/current/reference/html/#preface.requirements
Where to see the road map of Spring boot elasticsearch data plugin? When Do we get the plugin support for the 8.1 version of
Elasticsearch?
Thanks in advance

Answer 1

Adding the following headers resolved the issue.
Accept: "application/vnd.elasticsearch+json;compatible-with=7"
Content-Type: "application/vnd.elasticsearch+json;compatible-with=7"

Answer 2

Its better to change your code which is used for creating client
package com.search.elasticsearchapp.config;
import org.apache.http.Header;
import org.apache.http.HttpHost;
import org.apache.http.auth.AuthScope;
import org.apache.http.auth.UsernamePasswordCredentials;
import org.apache.http.client.CredentialsProvider;
import org.apache.http.impl.client.BasicCredentialsProvider;
import org.apache.http.message.BasicHeader;
import org.elasticsearch.client.RestClient;
import org.elasticsearch.client.RestClientBuilder;
import org.elasticsearch.client.RestHighLevelClient;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.elasticsearch.repository.config.EnableElasticsearchRepositories;
import org.springframework.http.HttpHeaders;
#Configuration
#EnableElasticsearchRepositories(basePackages = "*")
public class TestClient {
#Value("${elasticsearch.host}")
private String host;
#Value("${elasticsearch.port}")
private int port;
#Value("${elasticsearch.protocol}")
private String protocol;
#Value("${elasticsearch.username}")
private String userName;
#Value("${elasticsearch.password}")
private String password;
#Bean(destroyMethod = "close")
public RestHighLevelClient restClient() {
final CredentialsProvider credentialsProvider = new BasicCredentialsProvider();
credentialsProvider.setCredentials(AuthScope.ANY, new UsernamePasswordCredentials(userName, password));
RestClientBuilder builder = RestClient.builder(new HttpHost(host, port, protocol))
.setHttpClientConfigCallback(httpClientBuilder -> httpClientBuilder.setDefaultCredentialsProvider(credentialsProvider))
.setDefaultHeaders(compatibilityHeaders());
return new RestHighLevelClient(builder);
}
private Header[] compatibilityHeaders() {
return new Header[]{new BasicHeader(HttpHeaders.ACCEPT, "application/vnd.elasticsearch+json;compatible-with=7"), new BasicHeader(HttpHeaders.CONTENT_TYPE, "application/vnd.elasticsearch+json;compatible-with=7")};
}
}