Elasticsearch java RestHighLevelClient "Unable to parse response body" IllegalArgumentException: Required [index] - parsing

Question

I'm dealing with a problem when creating an index using the java RestHighLevelClient in Elasticsearch and my CreateIndexResponse object is in consequence null.
I am actually able to create the index, which I can confirm later querying it, but when I create the index, I get this exception. Here my code:
`CreateIndexRequest request = new CreateIndexRequest("myindex");
CreateIndexResponse createIndexResponse = client.indices().create(request);`
Elasticsearch returns the message of success with:
`HTTP 200 Success
{
"acknowledged": true,
"shards_acknowledged": true
}`
And I am actually able to retrieve the index later with a GET call, but when the RestHighLevelClient tries to parse the response, using the following internal call:
//Type of the response converter: CheckedFunction<Req, Request, IOException> requestConverter
responseConverter.apply(response);
The following exception happens:
java.io.IOException: Unable to parse response body for
Response{requestLine=PUT /myindex?master_timeout=30s&timeout=30s HTTP/1.1,
host=http://localhost:9200, response=HTTP/1.1 200 OK}
at org.elasticsearch.client.RestHighLevelClient.performRequest(RestHighLevelClient.java:507)
at org.elasticsearch.client.RestHighLevelClient.performRequestAndParseEntity(RestHighLevelClient.java:474)
at org.elasticsearch.client.IndicesClient.create(IndicesClient.java:77)
at hello.client.HelloClient.createSynch(HelloClient.java:84)
at hello.main.Main.main(Main.java:25)
Caused by: java.lang.IllegalArgumentException: Required [index]
So basically what this is saying is that the following response cannot be parsed, but for me it looks pretty parsable:
Response{requestLine=PUT /myindex?master_timeout=30s&timeout=30s HTTP/1.1,
host=http://localhost:9200, response=HTTP/1.1 200 OK}
Why does it tell me that the index is missing? Is it that I'm using wrongly the java client? This is the version:
<dependencies>
<dependency>
<groupId>org.elasticsearch.client</groupId>
<artifactId>elasticsearch-rest-high-level-client</artifactId>
<version>6.2.1</version>
</dependency>
</dependencies>`
Thanks in advance for the help!

Answer 1

You need to either update your version dependency or add compatibility headers (https://docs.spring.io/spring-data/elasticsearch/docs/current/reference/html/) as for my case even latest version of Spring-data-elastic search doesn't support version 8+ of Elastic Search. Had to configure my client like this:
#Configuration
#EnableElasticsearchRepositories(basePackages = "*")
public class ElasticsearchClientConfig {
#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")};
}
}