getting RestStatusException when saving a document

[shivam-agarwal-664]

elasticsearch: 8.4.2
spring-webmvc: 5.3.23
spring-data-elasticsearch: 4.4.3

I am getting RestStatusException when I try to save a document (it is saved in Elasticsearch).
Please let me know if any more information is required.

Logs:

2022-10-06 15:21:49.535 TRACE 67337 --- [ctor-http-nio-2] o.s.data.elasticsearch.client.WIRE       : [d62d7a5] Sending request POST /global_index/_doc with parameters: {timeout=1m}
Request body: {"created_at":"2022-10-06T09:51:49UTC","updated_at":"2022-10-06T09:51:49UTC","user_id":"USER0001","name":"John Doe","user_alias":"john-doe","country_code":"+1","phone_number":"9876543210","email_id":"john.doe@gmail.com"}
2022-10-06 15:21:49.586 TRACE 67337 --- [ctor-http-nio-2] o.s.data.elasticsearch.client.WIRE       : [d62d7a5] Received response: 201 CREATED
Response body: {"_index":"global_index","_id":"AXK1rIMB-wLzf9qPWa4x","_version":1,"result":"created","_shards":{"total":2,"successful":1,"failed":0},"_seq_no":62,"_primary_term":1}
2022-10-06 15:21:49.659 ERROR 67337 --- [  XNIO-1 task-1] io.undertow.request                      : UT005023: Exception handling request to /v1/user-test

org.springframework.web.util.NestedServletException: Request processing failed; nested exception is RestStatusException{status=201} org.springframework.data.elasticsearch.RestStatusException: {"_index":"global_index","_id":"AXK1rIMB-wLzf9qPWa4x","_version":1,"result":"created","_shards":{"total":2,"successful":1,"failed":0},"_seq_no":62,"_primary_term":1}
	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1014) ~[spring-webmvc-5.3.23.jar:5.3.23]
	at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:909) ~[spring-webmvc-5.3.23.jar:5.3.23]
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:517) ~[jakarta.servlet-api-4.0.4.jar:4.0.4]
	at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883) ~[spring-webmvc-5.3.23.jar:5.3.23]
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:584) ~[jakarta.servlet-api-4.0.4.jar:4.0.4]
	at io.undertow.servlet.handlers.ServletHandler.handleRequest(ServletHandler.java:74) ~[undertow-servlet-2.2.19.Final.jar:2.2.19.Final]
	at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:129) ~[undertow-servlet-2.2.19.Final.jar:2.2.19.Final]
	at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) ~[spring-web-5.3.23.jar:5.3.23]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117) ~[spring-web-5.3.23.jar:5.3.23]
	at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61) ~[undertow-servlet-2.2.19.Final.jar:2.2.19.Final]
	at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131) ~[undertow-servlet-2.2.19.Final.jar:2.2.19.Final]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:102) ~[spring-web-5.3.23.jar:5.3.23]
	at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61) ~[undertow-servlet-2.2.19.Final.jar:2.2.19.Final]
	at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131) ~[undertow-servlet-2.2.19.Final.jar:2.2.19.Final]
	at org.springframework.boot.actuate.metrics.web.servlet.WebMvcMetricsFilter.doFilterInternal(WebMvcMetricsFilter.java:96) ~[spring-boot-actuator-2.7.4.jar:2.7.4]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117) ~[spring-web-5.3.23.jar:5.3.23]
	at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61) ~[undertow-servlet-2.2.19.Final.jar:2.2.19.Final]
	at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131) ~[undertow-servlet-2.2.19.Final.jar:2.2.19.Final]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:102) ~[spring-web-5.3.23.jar:5.3.23]
	at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61) ~[undertow-servlet-2.2.19.Final.jar:2.2.19.Final]
	at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131) ~[undertow-servlet-2.2.19.Final.jar:2.2.19.Final]
	at io.undertow.servlet.handlers.FilterHandler.handleRequest(FilterHandler.java:84) ~[undertow-servlet-2.2.19.Final.jar:2.2.19.Final]
	at io.undertow.servlet.handlers.security.ServletSecurityRoleHandler.handleRequest(ServletSecurityRoleHandler.java:62) ~[undertow-servlet-2.2.19.Final.jar:2.2.19.Final]
	at io.undertow.servlet.handlers.ServletChain$1.handleRequest(ServletChain.java:68) ~[undertow-servlet-2.2.19.Final.jar:2.2.19.Final]
	at io.undertow.servlet.handlers.ServletDispatchingHandler.handleRequest(ServletDispatchingHandler.java:36) ~[undertow-servlet-2.2.19.Final.jar:2.2.19.Final]
	at io.undertow.servlet.handlers.RedirectDirHandler.handleRequest(RedirectDirHandler.java:68) ~[undertow-servlet-2.2.19.Final.jar:2.2.19.Final]
	at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) ~[undertow-core-2.2.19.Final.jar:2.2.19.Final]
	at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) ~[undertow-core-2.2.19.Final.jar:2.2.19.Final]
	at io.undertow.servlet.handlers.ServletInitialHandler.handleFirstRequest(ServletInitialHandler.java:275) ~[undertow-servlet-2.2.19.Final.jar:2.2.19.Final]
	at io.undertow.servlet.handlers.ServletInitialHandler.access$100(ServletInitialHandler.java:79) ~[undertow-servlet-2.2.19.Final.jar:2.2.19.Final]
	at io.undertow.servlet.handlers.ServletInitialHandler$2.call(ServletInitialHandler.java:134) ~[undertow-servlet-2.2.19.Final.jar:2.2.19.Final]
	at io.undertow.servlet.handlers.ServletInitialHandler$2.call(ServletInitialHandler.java:131) ~[undertow-servlet-2.2.19.Final.jar:2.2.19.Final]
	at io.undertow.servlet.core.ServletRequestContextThreadSetupAction$1.call(ServletRequestContextThreadSetupAction.java:48) ~[undertow-servlet-2.2.19.Final.jar:2.2.19.Final]
	at io.undertow.servlet.core.ContextClassLoaderSetupAction$1.call(ContextClassLoaderSetupAction.java:43) ~[undertow-servlet-2.2.19.Final.jar:2.2.19.Final]
	at io.undertow.servlet.handlers.ServletInitialHandler.dispatchRequest(ServletInitialHandler.java:255) ~[undertow-servlet-2.2.19.Final.jar:2.2.19.Final]
	at io.undertow.servlet.handlers.ServletInitialHandler.dispatchToPath(ServletInitialHandler.java:182) ~[undertow-servlet-2.2.19.Final.jar:2.2.19.Final]
	at io.undertow.servlet.spec.AsyncContextImpl$2$1.handleRequest(AsyncContextImpl.java:201) ~[undertow-servlet-2.2.19.Final.jar:2.2.19.Final]
	at io.undertow.server.Connectors.executeRootHandler(Connectors.java:387) ~[undertow-core-2.2.19.Final.jar:2.2.19.Final]
	at io.undertow.servlet.spec.AsyncContextImpl$2.run(AsyncContextImpl.java:195) ~[undertow-servlet-2.2.19.Final.jar:2.2.19.Final]
	at io.undertow.servlet.spec.AsyncContextImpl$6.run(AsyncContextImpl.java:472) ~[undertow-servlet-2.2.19.Final.jar:2.2.19.Final]
	at io.undertow.servlet.spec.AsyncContextImpl$TaskDispatchRunnable.run(AsyncContextImpl.java:591) ~[undertow-servlet-2.2.19.Final.jar:2.2.19.Final]
	at org.jboss.threads.ContextClassLoaderSavingRunnable.run(ContextClassLoaderSavingRunnable.java:35) ~[jboss-threads-3.1.0.Final.jar:3.1.0.Final]
	at org.jboss.threads.EnhancedQueueExecutor.safeRun(EnhancedQueueExecutor.java:2019) ~[jboss-threads-3.1.0.Final.jar:3.1.0.Final]
	at org.jboss.threads.EnhancedQueueExecutor$ThreadBody.doRunTask(EnhancedQueueExecutor.java:1558) ~[jboss-threads-3.1.0.Final.jar:3.1.0.Final]
	at org.jboss.threads.EnhancedQueueExecutor$ThreadBody.run(EnhancedQueueExecutor.java:1449) ~[jboss-threads-3.1.0.Final.jar:3.1.0.Final]
	at org.xnio.XnioWorker$WorkerThreadFactory$1$1.run(XnioWorker.java:1282) ~[xnio-api-3.8.7.Final.jar:3.8.7.Final]
	at java.base/java.lang.Thread.run(Thread.java:833) ~[na:na]
Caused by: org.springframework.data.elasticsearch.RestStatusException: {"_index":"global_index","_id":"AXK1rIMB-wLzf9qPWa4x","_version":1,"result":"created","_shards":{"total":2,"successful":1,"failed":0},"_seq_no":62,"_primary_term":1}
	at org.springframework.data.elasticsearch.client.reactive.DefaultReactiveElasticsearchClient.doDecode(DefaultReactiveElasticsearchClient.java:762) ~[spring-data-elasticsearch-4.4.3.jar:4.4.3]
	at org.springframework.data.elasticsearch.client.reactive.DefaultReactiveElasticsearchClient.lambda$readResponseBody$24(DefaultReactiveElasticsearchClient.java:738) ~[spring-data-elasticsearch-4.4.3.jar:4.4.3]
	at reactor.core.publisher.MonoFlatMap$FlatMapMain.onNext(MonoFlatMap.java:125) ~[reactor-core-3.4.23.jar:3.4.23]
	at reactor.core.publisher.FluxPeekFuseable$PeekFuseableSubscriber.onNext(FluxPeekFuseable.java:210) ~[reactor-core-3.4.23.jar:3.4.23]
	at reactor.core.publisher.FluxMapFuseable$MapFuseableSubscriber.onNext(FluxMapFuseable.java:129) ~[reactor-core-3.4.23.jar:3.4.23]
	at reactor.core.publisher.FluxOnAssembly$OnAssemblySubscriber.onNext(FluxOnAssembly.java:539) ~[reactor-core-3.4.23.jar:3.4.23]
	at reactor.core.publisher.FluxMapFuseable$MapFuseableSubscriber.onNext(FluxMapFuseable.java:129) ~[reactor-core-3.4.23.jar:3.4.23]
	at reactor.core.publisher.FluxContextWrite$ContextWriteSubscriber.onNext(FluxContextWrite.java:107) ~[reactor-core-3.4.23.jar:3.4.23]
	at reactor.core.publisher.FluxMapFuseable$MapFuseableConditionalSubscriber.onNext(FluxMapFuseable.java:299) ~[reactor-core-3.4.23.jar:3.4.23]
	at reactor.core.publisher.FluxFilterFuseable$FilterFuseableConditionalSubscriber.onNext(FluxFilterFuseable.java:337) ~[reactor-core-3.4.23.jar:3.4.23]
	at reactor.core.publisher.Operators$MonoSubscriber.complete(Operators.java:1816) ~[reactor-core-3.4.23.jar:3.4.23]
	at reactor.core.publisher.MonoCollect$CollectSubscriber.onComplete(MonoCollect.java:160) ~[reactor-core-3.4.23.jar:3.4.23]
	at reactor.core.publisher.FluxMap$MapSubscriber.onComplete(FluxMap.java:144) ~[reactor-core-3.4.23.jar:3.4.23]
	at reactor.core.publisher.FluxPeek$PeekSubscriber.onComplete(FluxPeek.java:260) ~[reactor-core-3.4.23.jar:3.4.23]
	at reactor.core.publisher.FluxMap$MapSubscriber.onComplete(FluxMap.java:144) ~[reactor-core-3.4.23.jar:3.4.23]
	at reactor.netty.channel.FluxReceive.onInboundComplete(FluxReceive.java:400) ~[reactor-netty-core-1.0.23.jar:1.0.23]
	at reactor.netty.channel.ChannelOperations.onInboundComplete(ChannelOperations.java:419) ~[reactor-netty-core-1.0.23.jar:1.0.23]
	at reactor.netty.channel.ChannelOperations.terminate(ChannelOperations.java:473) ~[reactor-netty-core-1.0.23.jar:1.0.23]
	at reactor.netty.http.client.HttpClientOperations.onInboundNext(HttpClientOperations.java:703) ~[reactor-netty-http-1.0.23.jar:1.0.23]
	at reactor.netty.channel.ChannelOperationsHandler.channelRead(ChannelOperationsHandler.java:93) ~[reactor-netty-core-1.0.23.jar:1.0.23]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379) ~[netty-transport-4.1.82.Final.jar:4.1.82.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365) ~[netty-transport-4.1.82.Final.jar:4.1.82.Final]
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357) ~[netty-transport-4.1.82.Final.jar:4.1.82.Final]
	at io.netty.handler.timeout.IdleStateHandler.channelRead(IdleStateHandler.java:286) ~[netty-handler-4.1.82.Final.jar:4.1.82.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379) ~[netty-transport-4.1.82.Final.jar:4.1.82.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365) ~[netty-transport-4.1.82.Final.jar:4.1.82.Final]
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357) ~[netty-transport-4.1.82.Final.jar:4.1.82.Final]
	at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:103) ~[netty-codec-4.1.82.Final.jar:4.1.82.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379) ~[netty-transport-4.1.82.Final.jar:4.1.82.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365) ~[netty-transport-4.1.82.Final.jar:4.1.82.Final]
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357) ~[netty-transport-4.1.82.Final.jar:4.1.82.Final]
	at io.netty.channel.CombinedChannelDuplexHandler$DelegatingChannelHandlerContext.fireChannelRead(CombinedChannelDuplexHandler.java:436) ~[netty-transport-4.1.82.Final.jar:4.1.82.Final]
	at io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:336) ~[netty-codec-4.1.82.Final.jar:4.1.82.Final]
	at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:308) ~[netty-codec-4.1.82.Final.jar:4.1.82.Final]
	at io.netty.channel.CombinedChannelDuplexHandler.channelRead(CombinedChannelDuplexHandler.java:251) ~[netty-transport-4.1.82.Final.jar:4.1.82.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379) ~[netty-transport-4.1.82.Final.jar:4.1.82.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365) ~[netty-transport-4.1.82.Final.jar:4.1.82.Final]
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357) ~[netty-transport-4.1.82.Final.jar:4.1.82.Final]
	at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1410) ~[netty-transport-4.1.82.Final.jar:4.1.82.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379) ~[netty-transport-4.1.82.Final.jar:4.1.82.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365) ~[netty-transport-4.1.82.Final.jar:4.1.82.Final]
	at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:919) ~[netty-transport-4.1.82.Final.jar:4.1.82.Final]
	at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:166) ~[netty-transport-4.1.82.Final.jar:4.1.82.Final]
	at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:788) ~[netty-transport-4.1.82.Final.jar:4.1.82.Final]
	at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:724) ~[netty-transport-4.1.82.Final.jar:4.1.82.Final]
	at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:650) ~[netty-transport-4.1.82.Final.jar:4.1.82.Final]
	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:562) ~[netty-transport-4.1.82.Final.jar:4.1.82.Final]
	at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:997) ~[netty-common-4.1.82.Final.jar:4.1.82.Final]
	at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74) ~[netty-common-4.1.82.Final.jar:4.1.82.Final]
	at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30) ~[netty-common-4.1.82.Final.jar:4.1.82.Final]
	... 1 common frames omitted

[sothawo]

There seems to be quite some strange mixup:

• You write that you use spring-webmvc, but your stacktrace show a reactive call, so is this a reactive program or imperative?
• You store data in global_index, but the failing call seems to go to /v1/user-test.
• Spring Data Elasticsearch 4.4.3 is built with Elasticsearch client libraries 7.17.3. This is not tested against Elasticsearch 8.

Can you provide a minimal project that reproduces this behaviour?

[shivam-agarwal-664]

@sothawo

• I am using both spring-webmvc and spring-webflux as I am writing my controllers in traditional imperative way but interacting with elasticsearch in reactive way, if that makes sense (just started exploring reactive programming).
• I am using global_index to store my data and /v1/user-test is the POST endpoint.
• I just tested with Elasticsearch 7.17.6 and it's working properly, but with Elasticsearch 8.4.2 I am getting above error.

I noticed one thing when running with elasticsearch 7.17.6, response:

2022-10-06 17:50:13.134 TRACE 81659 --- [ctor-http-nio-2] o.s.data.elasticsearch.client.WIRE       : [3057547f] Received response: 201 CREATED
Response body: {"_index":"global_index","_type":"_doc","_id":"Q5c9rYMBSQ1q94kLNK62","_version":1,"result":"created","_shards":{"total":2,"successful":1,"failed":0},"_seq_no":1,"_primary_term":2}

and for elasticsearch 8.4.2, response:

2022-10-06 15:21:49.586 TRACE 67337 --- [ctor-http-nio-2] o.s.data.elasticsearch.client.WIRE       : [d62d7a5] Received response: 201 CREATED
Response body: {"_index":"global_index","_id":"AXK1rIMB-wLzf9qPWa4x","_version":1,"result":"created","_shards":{"total":2,"successful":1,"failed":0},"_seq_no":62,"_primary_term":1}

"_type":"_doc" is missing in v8.4.2's response

[sothawo]

As I wrote Spring Data Elasticsearch 4.4 is built against Elasticsearch 7.17;

Have you set the compatibility headers (see https://docs.spring.io/spring-data/elasticsearch/docs/current/reference/html/#elasticsearch.clients.configuration, section 5.3.1). That might help to get it to work, but no guarantees.

[shivam-agarwal-664]

@sothawo I tried setting the headers in section 5.3.1 (below is the configuration class)

@Configuration
public class ElasticsearchConfig extends AbstractReactiveElasticsearchConfiguration {
  @Override
  @Bean
  public ReactiveElasticsearchClient reactiveElasticsearchClient() {
    final ClientConfiguration clientConfiguration =
        ClientConfiguration.builder()
            .connectedTo("localhost:9200")
            .withBasicAuth("elastic", "")
            .withHeaders(
                () -> {
                  HttpHeaders compatibilityHeaders = new HttpHeaders();
                  compatibilityHeaders.add(
                      HttpHeaders.ACCEPT, "application/vnd.elasticsearch+json;compatible-with=7");
                  compatibilityHeaders.add(
                      HttpHeaders.CONTENT_TYPE,
                      "application/vnd.elasticsearch+json;compatible-with=7");
                  return compatibilityHeaders;
                })
            .build();
    return ReactiveRestClients.create(clientConfiguration);
  }

  @Override
  protected boolean writeTypeHints() {
    return false;
  }
}

but when I try to use it, I get ElasticsearchException (below are the logs)

2022-10-07 11:59:20.193 TRACE 25538 --- [  XNIO-1 task-1] o.s.data.elasticsearch.client.WIRE       : [55e195eb] Sending request POST /global_index/_doc with parameters: {timeout=1m}
Request body: {"created_at":"2022-10-07T06:29:20UTC","updated_at":"2022-10-07T06:29:20UTC","user_id":"USER0001","name":"John Doe","user_alias":"john-doe","country_code":"+1","phone_number":"9876543210","email_id":"john.doe@gmail.com"}
2022-10-07 11:59:20.210 TRACE 25538 --- [ctor-http-nio-2] o.s.data.elasticsearch.client.WIRE       : [55e195eb] Received raw response: 400 BAD_REQUEST
2022-10-07 11:59:20.218 ERROR 25538 --- [  XNIO-1 task-1] io.undertow.request                      : UT005023: Exception handling request to /v1/user-test

org.springframework.web.util.NestedServletException: Request processing failed; nested exception is RestStatusException{status=400} org.springframework.data.elasticsearch.RestStatusException: Elasticsearch exception [type=media_type_header_exception, reason=Invalid media-type value on headers [Content-Type]], Elasticsearch exception [type=media_type_header_exception, reason=Invalid media-type value on headers [Content-Type]], Elasticsearch exception [type=media_type_header_exception, reason=Invalid media-type value on headers [Accept, Content-Type]]; nested exception is ElasticsearchException[Elasticsearch exception [type=media_type_header_exception, reason=Invalid media-type value on headers [Content-Type]]]; nested: ElasticsearchException[Elasticsearch exception [type=illegal_argument_exception, reason=Incorrect header [Content-Type]. Only one value should be provided]];
	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1014) ~[spring-webmvc-5.3.23.jar:5.3.23]
	at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:909) ~[spring-webmvc-5.3.23.jar:5.3.23]
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:517) ~[jakarta.servlet-api-4.0.4.jar:4.0.4]
	at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883) ~[spring-webmvc-5.3.23.jar:5.3.23]
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:584) ~[jakarta.servlet-api-4.0.4.jar:4.0.4]
	at io.undertow.servlet.handlers.ServletHandler.handleRequest(ServletHandler.java:74) ~[undertow-servlet-2.2.19.Final.jar:2.2.19.Final]
	at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:129) ~[undertow-servlet-2.2.19.Final.jar:2.2.19.Final]
	at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) ~[spring-web-5.3.23.jar:5.3.23]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117) ~[spring-web-5.3.23.jar:5.3.23]
	at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61) ~[undertow-servlet-2.2.19.Final.jar:2.2.19.Final]
	at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131) ~[undertow-servlet-2.2.19.Final.jar:2.2.19.Final]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:102) ~[spring-web-5.3.23.jar:5.3.23]
	at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61) ~[undertow-servlet-2.2.19.Final.jar:2.2.19.Final]
	at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131) ~[undertow-servlet-2.2.19.Final.jar:2.2.19.Final]
	at org.springframework.boot.actuate.metrics.web.servlet.WebMvcMetricsFilter.doFilterInternal(WebMvcMetricsFilter.java:96) ~[spring-boot-actuator-2.7.4.jar:2.7.4]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117) ~[spring-web-5.3.23.jar:5.3.23]
	at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61) ~[undertow-servlet-2.2.19.Final.jar:2.2.19.Final]
	at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131) ~[undertow-servlet-2.2.19.Final.jar:2.2.19.Final]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:102) ~[spring-web-5.3.23.jar:5.3.23]
	at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61) ~[undertow-servlet-2.2.19.Final.jar:2.2.19.Final]
	at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131) ~[undertow-servlet-2.2.19.Final.jar:2.2.19.Final]
	at io.undertow.servlet.handlers.FilterHandler.handleRequest(FilterHandler.java:84) ~[undertow-servlet-2.2.19.Final.jar:2.2.19.Final]
	at io.undertow.servlet.handlers.security.ServletSecurityRoleHandler.handleRequest(ServletSecurityRoleHandler.java:62) ~[undertow-servlet-2.2.19.Final.jar:2.2.19.Final]
	at io.undertow.servlet.handlers.ServletChain$1.handleRequest(ServletChain.java:68) ~[undertow-servlet-2.2.19.Final.jar:2.2.19.Final]
	at io.undertow.servlet.handlers.ServletDispatchingHandler.handleRequest(ServletDispatchingHandler.java:36) ~[undertow-servlet-2.2.19.Final.jar:2.2.19.Final]
	at io.undertow.servlet.handlers.RedirectDirHandler.handleRequest(RedirectDirHandler.java:68) ~[undertow-servlet-2.2.19.Final.jar:2.2.19.Final]
	at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) ~[undertow-core-2.2.19.Final.jar:2.2.19.Final]
	at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) ~[undertow-core-2.2.19.Final.jar:2.2.19.Final]
	at io.undertow.servlet.handlers.ServletInitialHandler.handleFirstRequest(ServletInitialHandler.java:275) ~[undertow-servlet-2.2.19.Final.jar:2.2.19.Final]
	at io.undertow.servlet.handlers.ServletInitialHandler.access$100(ServletInitialHandler.java:79) ~[undertow-servlet-2.2.19.Final.jar:2.2.19.Final]
	at io.undertow.servlet.handlers.ServletInitialHandler$2.call(ServletInitialHandler.java:134) ~[undertow-servlet-2.2.19.Final.jar:2.2.19.Final]
	at io.undertow.servlet.handlers.ServletInitialHandler$2.call(ServletInitialHandler.java:131) ~[undertow-servlet-2.2.19.Final.jar:2.2.19.Final]
	at io.undertow.servlet.core.ServletRequestContextThreadSetupAction$1.call(ServletRequestContextThreadSetupAction.java:48) ~[undertow-servlet-2.2.19.Final.jar:2.2.19.Final]
	at io.undertow.servlet.core.ContextClassLoaderSetupAction$1.call(ContextClassLoaderSetupAction.java:43) ~[undertow-servlet-2.2.19.Final.jar:2.2.19.Final]
	at io.undertow.servlet.handlers.ServletInitialHandler.dispatchRequest(ServletInitialHandler.java:255) ~[undertow-servlet-2.2.19.Final.jar:2.2.19.Final]
	at io.undertow.servlet.handlers.ServletInitialHandler.dispatchToPath(ServletInitialHandler.java:182) ~[undertow-servlet-2.2.19.Final.jar:2.2.19.Final]
	at io.undertow.servlet.spec.AsyncContextImpl$2$1.handleRequest(AsyncContextImpl.java:201) ~[undertow-servlet-2.2.19.Final.jar:2.2.19.Final]
	at io.undertow.server.Connectors.executeRootHandler(Connectors.java:387) ~[undertow-core-2.2.19.Final.jar:2.2.19.Final]
	at io.undertow.servlet.spec.AsyncContextImpl$2.run(AsyncContextImpl.java:195) ~[undertow-servlet-2.2.19.Final.jar:2.2.19.Final]
	at io.undertow.servlet.spec.AsyncContextImpl$6.run(AsyncContextImpl.java:472) ~[undertow-servlet-2.2.19.Final.jar:2.2.19.Final]
	at io.undertow.servlet.spec.AsyncContextImpl$TaskDispatchRunnable.run(AsyncContextImpl.java:591) ~[undertow-servlet-2.2.19.Final.jar:2.2.19.Final]
	at org.jboss.threads.ContextClassLoaderSavingRunnable.run(ContextClassLoaderSavingRunnable.java:35) ~[jboss-threads-3.1.0.Final.jar:3.1.0.Final]
	at org.jboss.threads.EnhancedQueueExecutor.safeRun(EnhancedQueueExecutor.java:2019) ~[jboss-threads-3.1.0.Final.jar:3.1.0.Final]
	at org.jboss.threads.EnhancedQueueExecutor$ThreadBody.doRunTask(EnhancedQueueExecutor.java:1558) ~[jboss-threads-3.1.0.Final.jar:3.1.0.Final]
	at org.jboss.threads.EnhancedQueueExecutor$ThreadBody.run(EnhancedQueueExecutor.java:1449) ~[jboss-threads-3.1.0.Final.jar:3.1.0.Final]
	at org.xnio.XnioWorker$WorkerThreadFactory$1$1.run(XnioWorker.java:1282) ~[xnio-api-3.8.7.Final.jar:3.8.7.Final]
	at java.base/java.lang.Thread.run(Thread.java:833) ~[na:na]
Caused by: org.springframework.data.elasticsearch.RestStatusException: Elasticsearch exception [type=media_type_header_exception, reason=Invalid media-type value on headers [Content-Type]], Elasticsearch exception [type=media_type_header_exception, reason=Invalid media-type value on headers [Content-Type]], Elasticsearch exception [type=media_type_header_exception, reason=Invalid media-type value on headers [Accept, Content-Type]]; nested exception is ElasticsearchException[Elasticsearch exception [type=media_type_header_exception, reason=Invalid media-type value on headers [Content-Type]]]; nested: ElasticsearchException[Elasticsearch exception [type=illegal_argument_exception, reason=Incorrect header [Content-Type]. Only one value should be provided]];
	at org.springframework.data.elasticsearch.client.reactive.DefaultReactiveElasticsearchClient.contentOrError(DefaultReactiveElasticsearchClient.java:834) ~[spring-data-elasticsearch-4.4.3.jar:4.4.3]
	at org.springframework.data.elasticsearch.client.reactive.DefaultReactiveElasticsearchClient.lambda$handleClientError$30(DefaultReactiveElasticsearchClient.java:813) ~[spring-data-elasticsearch-4.4.3.jar:4.4.3]
	at reactor.core.publisher.MonoFlatMap$FlatMapMain.onNext(MonoFlatMap.java:125) ~[reactor-core-3.4.23.jar:3.4.23]
	at reactor.core.publisher.FluxMapFuseable$MapFuseableSubscriber.onNext(FluxMapFuseable.java:129) ~[reactor-core-3.4.23.jar:3.4.23]
	at reactor.core.publisher.FluxOnAssembly$OnAssemblySubscriber.onNext(FluxOnAssembly.java:539) ~[reactor-core-3.4.23.jar:3.4.23]
	at reactor.core.publisher.FluxMapFuseable$MapFuseableSubscriber.onNext(FluxMapFuseable.java:129) ~[reactor-core-3.4.23.jar:3.4.23]
	at reactor.core.publisher.FluxContextWrite$ContextWriteSubscriber.onNext(FluxContextWrite.java:107) ~[reactor-core-3.4.23.jar:3.4.23]
	at reactor.core.publisher.FluxMapFuseable$MapFuseableConditionalSubscriber.onNext(FluxMapFuseable.java:299) ~[reactor-core-3.4.23.jar:3.4.23]
	at reactor.core.publisher.FluxFilterFuseable$FilterFuseableConditionalSubscriber.onNext(FluxFilterFuseable.java:337) ~[reactor-core-3.4.23.jar:3.4.23]
	at reactor.core.publisher.Operators$MonoSubscriber.complete(Operators.java:1816) ~[reactor-core-3.4.23.jar:3.4.23]
	at reactor.core.publisher.MonoCollect$CollectSubscriber.onComplete(MonoCollect.java:160) ~[reactor-core-3.4.23.jar:3.4.23]
	at reactor.core.publisher.FluxMap$MapSubscriber.onComplete(FluxMap.java:144) ~[reactor-core-3.4.23.jar:3.4.23]
	at reactor.core.publisher.FluxPeek$PeekSubscriber.onComplete(FluxPeek.java:260) ~[reactor-core-3.4.23.jar:3.4.23]
	at reactor.core.publisher.FluxMap$MapSubscriber.onComplete(FluxMap.java:144) ~[reactor-core-3.4.23.jar:3.4.23]
	at reactor.netty.channel.FluxReceive.onInboundComplete(FluxReceive.java:400) ~[reactor-netty-core-1.0.23.jar:1.0.23]
	at reactor.netty.channel.ChannelOperations.onInboundComplete(ChannelOperations.java:419) ~[reactor-netty-core-1.0.23.jar:1.0.23]
	at reactor.netty.channel.ChannelOperations.terminate(ChannelOperations.java:473) ~[reactor-netty-core-1.0.23.jar:1.0.23]
	at reactor.netty.http.client.HttpClientOperations.onInboundNext(HttpClientOperations.java:703) ~[reactor-netty-http-1.0.23.jar:1.0.23]
	at reactor.netty.channel.ChannelOperationsHandler.channelRead(ChannelOperationsHandler.java:93) ~[reactor-netty-core-1.0.23.jar:1.0.23]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379) ~[netty-transport-4.1.82.Final.jar:4.1.82.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365) ~[netty-transport-4.1.82.Final.jar:4.1.82.Final]
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357) ~[netty-transport-4.1.82.Final.jar:4.1.82.Final]
	at io.netty.handler.timeout.IdleStateHandler.channelRead(IdleStateHandler.java:286) ~[netty-handler-4.1.82.Final.jar:4.1.82.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379) ~[netty-transport-4.1.82.Final.jar:4.1.82.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365) ~[netty-transport-4.1.82.Final.jar:4.1.82.Final]
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357) ~[netty-transport-4.1.82.Final.jar:4.1.82.Final]
	at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:103) ~[netty-codec-4.1.82.Final.jar:4.1.82.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379) ~[netty-transport-4.1.82.Final.jar:4.1.82.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365) ~[netty-transport-4.1.82.Final.jar:4.1.82.Final]
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357) ~[netty-transport-4.1.82.Final.jar:4.1.82.Final]
	at io.netty.channel.CombinedChannelDuplexHandler$DelegatingChannelHandlerContext.fireChannelRead(CombinedChannelDuplexHandler.java:436) ~[netty-transport-4.1.82.Final.jar:4.1.82.Final]
	at io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:336) ~[netty-codec-4.1.82.Final.jar:4.1.82.Final]
	at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:308) ~[netty-codec-4.1.82.Final.jar:4.1.82.Final]
	at io.netty.channel.CombinedChannelDuplexHandler.channelRead(CombinedChannelDuplexHandler.java:251) ~[netty-transport-4.1.82.Final.jar:4.1.82.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379) ~[netty-transport-4.1.82.Final.jar:4.1.82.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365) ~[netty-transport-4.1.82.Final.jar:4.1.82.Final]
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357) ~[netty-transport-4.1.82.Final.jar:4.1.82.Final]
	at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1410) ~[netty-transport-4.1.82.Final.jar:4.1.82.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379) ~[netty-transport-4.1.82.Final.jar:4.1.82.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365) ~[netty-transport-4.1.82.Final.jar:4.1.82.Final]
	at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:919) ~[netty-transport-4.1.82.Final.jar:4.1.82.Final]
	at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:166) ~[netty-transport-4.1.82.Final.jar:4.1.82.Final]
	at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:788) ~[netty-transport-4.1.82.Final.jar:4.1.82.Final]
	at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:724) ~[netty-transport-4.1.82.Final.jar:4.1.82.Final]
	at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:650) ~[netty-transport-4.1.82.Final.jar:4.1.82.Final]
	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:562) ~[netty-transport-4.1.82.Final.jar:4.1.82.Final]
	at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:997) ~[netty-common-4.1.82.Final.jar:4.1.82.Final]
	at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74) ~[netty-common-4.1.82.Final.jar:4.1.82.Final]
	at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30) ~[netty-common-4.1.82.Final.jar:4.1.82.Final]
	... 1 common frames omitted
Caused by: org.elasticsearch.ElasticsearchException: Elasticsearch exception [type=media_type_header_exception, reason=Invalid media-type value on headers [Content-Type]]
	at org.elasticsearch.ElasticsearchException.innerFromXContent(ElasticsearchException.java:491) ~[elasticsearch-7.17.6.jar:7.17.6]
	at org.elasticsearch.ElasticsearchException.failureFromXContent(ElasticsearchException.java:598) ~[elasticsearch-7.17.6.jar:7.17.6]
	at org.springframework.data.elasticsearch.client.reactive.DefaultReactiveElasticsearchClient.getElasticsearchException(DefaultReactiveElasticsearchClient.java:860) ~[spring-data-elasticsearch-4.4.3.jar:4.4.3]
	at org.springframework.data.elasticsearch.client.reactive.DefaultReactiveElasticsearchClient.contentOrError(DefaultReactiveElasticsearchClient.java:829) ~[spring-data-elasticsearch-4.4.3.jar:4.4.3]
	... 49 common frames omitted
	Suppressed: org.elasticsearch.ElasticsearchException: Elasticsearch exception [type=media_type_header_exception, reason=Invalid media-type value on headers [Content-Type]]
		at org.elasticsearch.ElasticsearchException.innerFromXContent(ElasticsearchException.java:491) ~[elasticsearch-7.17.6.jar:7.17.6]
		at org.elasticsearch.ElasticsearchException.fromXContent(ElasticsearchException.java:402) ~[elasticsearch-7.17.6.jar:7.17.6]
		at org.elasticsearch.ElasticsearchException.innerFromXContent(ElasticsearchException.java:464) ~[elasticsearch-7.17.6.jar:7.17.6]
		... 52 common frames omitted
	Suppressed: org.elasticsearch.ElasticsearchException: Elasticsearch exception [type=media_type_header_exception, reason=Invalid media-type value on headers [Accept, Content-Type]]
		at org.elasticsearch.ElasticsearchException.innerFromXContent(ElasticsearchException.java:491) ~[elasticsearch-7.17.6.jar:7.17.6]
		at org.elasticsearch.ElasticsearchException.fromXContent(ElasticsearchException.java:402) ~[elasticsearch-7.17.6.jar:7.17.6]
		at org.elasticsearch.ElasticsearchException.innerFromXContent(ElasticsearchException.java:468) ~[elasticsearch-7.17.6.jar:7.17.6]
		... 52 common frames omitted
	Caused by: org.elasticsearch.ElasticsearchException: Elasticsearch exception [type=status_exception, reason=A compatible version is required on both Content-Type and Accept headers if either one has requested a compatible version and the compatible versions must match. Accept=application/vnd.elasticsearch+json;compatible-with=7, Content-Type=null]
		at org.elasticsearch.ElasticsearchException.innerFromXContent(ElasticsearchException.java:491)
		at org.elasticsearch.ElasticsearchException.fromXContent(ElasticsearchException.java:402)
		at org.elasticsearch.ElasticsearchException.innerFromXContent(ElasticsearchException.java:432)
		... 54 common frames omitted
Caused by: org.elasticsearch.ElasticsearchException: Elasticsearch exception [type=illegal_argument_exception, reason=Incorrect header [Content-Type]. Only one value should be provided]
	at org.elasticsearch.ElasticsearchException.innerFromXContent(ElasticsearchException.java:491) ~[elasticsearch-7.17.6.jar:7.17.6]
	at org.elasticsearch.ElasticsearchException.fromXContent(ElasticsearchException.java:402) ~[elasticsearch-7.17.6.jar:7.17.6]
	at org.elasticsearch.ElasticsearchException.innerFromXContent(ElasticsearchException.java:432) ~[elasticsearch-7.17.6.jar:7.17.6]
	... 52 common frames omitted

[sothawo]

ok, made some tests and found, that the reactive client in version 4.4 always adds a content-type: application/json header for a request that has a body. The compatibility header then is added as well and that leads to the error you see after setting this header.

Fixed this with #2328.