UpdateByQuery Slices property is not creating right request querystring parameter

[MsAarti]

Elastic.Clients.Elasticsearch version: 8.14.7

Elasticsearch version: 8.10.2

.NET runtime version: 4.8.04084

Operating system version: Microsoft Windows 10 Enterprise v10.0.19043.0

Description of the problem including expected versus actual behavior:
Creating UpdateByQueryRequest with Slices to specify slice number constructs incorrect request querystring parameter leading to failure

Steps to reproduce:

Code snip:
var updateByQueryRequest = new UpdateByQueryRequest("IndexName")
{
WaitForCompletion = false,
Query = updateByQuery,
Slices = new Slices(SlicesCalculation.Auto) //Buggy part
}

The debug information revealed that the request endpoint is not created right.
FailureReason: BadResponse while attempting POST on https://ESHost:9200/IndexName/_update_by_query?pretty=true&error_trace=true&wait_for_completion=false&slices=Elastic.Clients.Elasticsearch.Slices

Expected behavior
Below is the expected endpoint with correct request query string parameter value for slices.
https://ESHost:9200/IndexName/_update_by_query?pretty=true&error_trace=true&wait_for_completion=false&slices=auto

Provide ConnectionSettings (if relevant):

Provide DebugInformation (if relevant):
Response part from DebugInformation
{
"error" : {
"root_cause" : [
{
"type" : "illegal_argument_exception",
"reason" : "[slices] must be a positive integer or the string "auto", but was [Elastic.Clients.Elasticsearch.Slices]",
"stack_trace" : "org.elasticsearch.ElasticsearchException$1: [slices] must be a positive integer or the string "auto", but was [Elastic.Clients.Elasticsearch.Slices]\n\tat org.elasticsearch.server@8.10.2/org.elasticsearch.ElasticsearchException.guessRootCauses(ElasticsearchException.java:667)\n\tat org.elasticsearch.server@8.10.2/org.elasticsearch.ElasticsearchException.generateFailureXContent(ElasticsearchException.java:595)\n\tat org.elasticsearch.server@8.10.2/org.elasticsearch.rest.RestResponse.build(RestResponse.java:176)\n\tat org.elasticsearch.server@8.10.2/org.elasticsearch.rest.RestResponse.(RestResponse.java:124)\n\tat org.elasticsearch.server@8.10.2/org.elasticsearch.rest.RestResponse.(RestResponse.java:103)\n\tat org.elasticsearch.security@8.10.2/org.elasticsearch.xpack.security.rest.SecurityRestFilter.handleException(SecurityRestFilter.java:108)\n\tat org.elasticsearch.security@8.10.2/org.elasticsearch.xpack.security.rest.SecurityRestFilter.lambda$handleRequest$1(SecurityRestFilter.java:88)\n\tat org.elasticsearch.server@8.10.2/org.elasticsearch.action.ActionListenerImplementations.safeAcceptException(ActionListenerImplementations.java:62)\n\tat org.elasticsearch.server@8.10.2/org.elasticsearch.action.ActionListener$2.onFailure(ActionListener.java:185)\n\tat org.elasticsearch.server@8.10.2/org.elasticsearch.action.ActionListener$2.onResponse(ActionListener.java:179)\n\tat org.elasticsearch.security@8.10.2/org.elasticsearch.xpack.security.authc.support.SecondaryAuthenticator.lambda$authenticateAndAttachToContext$3(SecondaryAuthenticator.java:99)\n\tat org.elasticsearch.server@8.10.2/org.elasticsearch.action.ActionListenerImplementations$ResponseWrappingActionListener.onResponse(ActionListenerImplementations.java:236)\n\tat org.elasticsearch.security@8.10.2/org.elasticsearch.xpack.security.authc.support.SecondaryAuthenticator.authenticate(SecondaryAuthenticator.java:109)\n\tat org.elasticsearch.security@8.10.2/org.elasticsearch.xpack.security.authc.support.SecondaryAuthenticator.authenticateAndAttachToContext(SecondaryAuthenticator.java:90)\n\tat org.elasticsearch.security@8.10.2/org.elasticsearch.xpack.security.rest.SecurityRestFilter.handleRequest(SecurityRestFilter.java:82)\n\tat org.elasticsearch.server@8.10.2/org.elasticsearch.rest.RestController.dispatchRequest(RestController.java:415)\n\tat org.elasticsearch.server@8.10.2/org.elasticsearch.rest.RestController.tryAllHandlers(RestController.java:544)\n\tat org.elasticsearch.server@8.10.2/org.elasticsearch.rest.RestController.dispatchRequest(RestController.java:317)\n\tat org.elasticsearch.server@8.10.2/org.elasticsearch.http.AbstractHttpServerTransport.dispatchRequest(AbstractHttpServerTransport.java:453)\n\tat org.elasticsearch.server@8.10.2/org.elasticsearch.http.AbstractHttpServerTransport.handleIncomingRequest(AbstractHttpServerTransport.java:549)\n\tat org.elasticsearch.server@8.10.2/org.elasticsearch.http.AbstractHttpServerTransport.incomingRequest(AbstractHttpServerTransport.java:426)\n\tat org.elasticsearch.transport.netty4@8.10.2/org.elasticsearch.http.netty4.Netty4HttpPipeliningHandler.handlePipelinedRequest(Netty4HttpPipeliningHandler.java:128)\n\tat org.elasticsearch.transport.netty4@8.10.2/org.elasticsearch.http.netty4.Netty4HttpPipeliningHandler.channelRead(Netty4HttpPipeliningHandler.java:118)\n\tat io.netty.transport@4.1.94.Final/io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:442)\n\tat io.netty.transport@4.1.94.Final/io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420)\n\tat io.netty.transport@4.1.94.Final/io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:412)\n\tat io.netty.codec@4.1.94.Final/io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:103)\n\tat io.netty.transport@4.1.94.Final/io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:444)\n\tat io.netty.transport@4.1.94.Final/io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420)\n\tat io.netty.transport@4.1.94.Final/io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:412)\n\tat io.netty.codec@4.1.94.Final/io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:103)\n\tat io.netty.transport@4.1.94.Final/io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:444)\n\tat io.netty.transport@4.1.94.Final/io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420)\n\tat io.netty.transport@4.1.94.Final/io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:412)\n\tat org.elasticsearch.transport.netty4@8.10.2/org.elasticsearch.http.netty4.Netty4HttpHeaderValidator.forwardData(Netty4HttpHeaderValidator.java:194)\n\tat org.elasticsearch.transport.netty4@8.10.2/org.elasticsearch.http.netty4.Netty4HttpHeaderValidator.forwardFullRequest(Netty4HttpHeaderValidator.java:137)\n\tat org.elasticsearch.transport.netty4@8.10.2/org.elasticsearch.http.netty4.Netty4HttpHeaderValidator.lambda$requestStart$1(Netty4HttpHeaderValidator.java:120)\n\tat io.netty.common@4.1.94.Final/io.netty.util.concurrent.PromiseTask.runTask(PromiseTask.java:98)\n\tat io.netty.common@4.1.94.Final/io.netty.util.concurrent.PromiseTask.run(PromiseTask.java:106)\n\tat io.netty.common@4.1.94.Final/io.netty.util.concurrent.AbstractEventExecutor.runTask(AbstractEventExecutor.java:174)\n\tat io.netty.common@4.1.94.Final/io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:167)\n\tat io.netty.common@4.1.94.Final/io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:470)\n\tat io.netty.transport@4.1.94.Final/io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:566)\n\tat io.netty.common@4.1.94.Final/io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:997)\n\tat io.netty.common@4.1.94.Final/io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)\n\tat java.base/java.lang.Thread.run(Thread.java:1623)\nCaused by: java.lang.IllegalArgumentException: [slices] must be a positive integer or the string "auto", but was [Elastic.Clients.Elasticsearch.Slices]\n\tat org.elasticsearch.reindex.AbstractBaseReindexRestHandler.parseSlices(AbstractBaseReindexRestHandler.java:135)\n\tat org.elasticsearch.reindex.AbstractBaseReindexRestHandler.setCommonOptions(AbstractBaseReindexRestHandler.java:88)\n\tat org.elasticsearch.reindex.AbstractBaseReindexRestHandler.doPrepareRequest(AbstractBaseReindexRestHandler.java:45)\n\tat org.elasticsearch.reindex.RestUpdateByQueryAction.prepareRequest(RestUpdateByQueryAction.java:54)\n\tat org.elasticsearch.server@8.10.2/org.elasticsearch.rest.BaseRestHandler.handleRequest(BaseRestHandler.java:80)\n\tat org.elasticsearch.security@8.10.2/org.elasticsearch.xpack.security.rest.SecurityRestFilter.doHandleRequest(SecurityRestFilter.java:96)\n\tat org.elasticsearch.security@8.10.2/org.elasticsearch.xpack.security.rest.SecurityRestFilter.lambda$handleRequest$0(SecurityRestFilter.java:87)\n\tat org.elasticsearch.server@8.10.2/org.elasticsearch.action.ActionListener$2.onResponse(ActionListener.java:177)\n\t... 36 more\nCaused by: java.lang.NumberFormatException: For input string: "Elastic.Clients.Elasticsearch.Slices"\n\tat java.base/java.lang.NumberFormatException.forInputString(NumberFormatException.java:67)\n\tat java.base/java.lang.Integer.parseInt(Integer.java:665)\n\tat java.base/java.lang.Integer.parseInt(Integer.java:781)\n\tat org.elasticsearch.reindex.AbstractBaseReindexRestHandler.parseSlices(AbstractBaseReindexRestHandler.java:133)\n\t... 43 more\n"
}
],
"type" : "illegal_argument_exception",
"reason" : "[slices] must be a positive integer or the string "auto", but was [Elastic.Clients.Elasticsearch.Slices]",
"caused_by" : {
"type" : "number_format_exception",
"reason" : "For input string: "Elastic.Clients.Elasticsearch.Slices"",
"stack_trace" : "java.lang.NumberFormatException: For input string: "Elastic.Clients.Elasticsearch.Slices"\n\tat java.base/java.lang.NumberFormatException.forInputString(NumberFormatException.java:67)\n\tat java.base/java.lang.Integer.parseInt(Integer.java:665)\n\tat java.base/java.lang.Integer.parseInt(Integer.java:781)\n\tat org.elasticsearch.reindex.AbstractBaseReindexRestHandler.parseSlices(AbstractBaseReindexRestHandler.java:133)\n\tat org.elasticsearch.reindex.AbstractBaseReindexRestHandler.setCommonOptions(AbstractBaseReindexRestHandler.java:88)\n\tat org.elasticsearch.reindex.AbstractBaseReindexRestHandler.doPrepareRequest(AbstractBaseReindexRestHandler.java:45)\n\tat org.elasticsearch.reindex.RestUpdateByQueryAction.prepareRequest(RestUpdateByQueryAction.java:54)\n\tat org.elasticsearch.server@8.10.2/org.elasticsearch.rest.BaseRestHandler.handleRequest(BaseRestHandler.java:80)\n\tat org.elasticsearch.security@8.10.2/org.elasticsearch.xpack.security.rest.SecurityRestFilter.doHandleRequest(SecurityRestFilter.java:96)\n\tat org.elasticsearch.security@8.10.2/org.elasticsearch.xpack.security.rest.SecurityRestFilter.lambda$handleRequest$0(SecurityRestFilter.java:87)\n\tat org.elasticsearch.server@8.10.2/org.elasticsearch.action.ActionListener$2.onResponse(ActionListener.java:177)\n\tat org.elasticsearch.security@8.10.2/org.elasticsearch.xpack.security.authc.support.SecondaryAuthenticator.lambda$authenticateAndAttachToContext$3(SecondaryAuthenticator.java:99)\n\tat org.elasticsearch.server@8.10.2/org.elasticsearch.action.ActionListenerImplementations$ResponseWrappingActionListener.onResponse(ActionListenerImplementations.java:236)\n\tat org.elasticsearch.security@8.10.2/org.elasticsearch.xpack.security.authc.support.SecondaryAuthenticator.authenticate(SecondaryAuthenticator.java:109)\n\tat org.elasticsearch.security@8.10.2/org.elasticsearch.xpack.security.authc.support.SecondaryAuthenticator.authenticateAndAttachToContext(SecondaryAuthenticator.java:90)\n\tat org.elasticsearch.security@8.10.2/org.elasticsearch.xpack.security.rest.SecurityRestFilter.handleRequest(SecurityRestFilter.java:82)\n\tat org.elasticsearch.server@8.10.2/org.elasticsearch.rest.RestController.dispatchRequest(RestController.java:415)\n\tat org.elasticsearch.server@8.10.2/org.elasticsearch.rest.RestController.tryAllHandlers(RestController.java:544)\n\tat org.elasticsearch.server@8.10.2/org.elasticsearch.rest.RestController.dispatchRequest(RestController.java:317)\n\tat org.elasticsearch.server@8.10.2/org.elasticsearch.http.AbstractHttpServerTransport.dispatchRequest(AbstractHttpServerTransport.java:453)\n\tat org.elasticsearch.server@8.10.2/org.elasticsearch.http.AbstractHttpServerTransport.handleIncomingRequest(AbstractHttpServerTransport.java:549)\n\tat org.elasticsearch.server@8.10.2/org.elasticsearch.http.AbstractHttpServerTransport.incomingRequest(AbstractHttpServerTransport.java:426)\n\tat org.elasticsearch.transport.netty4@8.10.2/org.elasticsearch.http.netty4.Netty4HttpPipeliningHandler.handlePipelinedRequest(Netty4HttpPipeliningHandler.java:128)\n\tat org.elasticsearch.transport.netty4@8.10.2/org.elasticsearch.http.netty4.Netty4HttpPipeliningHandler.channelRead(Netty4HttpPipeliningHandler.java:118)\n\tat io.netty.transport@4.1.94.Final/io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:442)\n\tat io.netty.transport@4.1.94.Final/io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420)\n\tat io.netty.transport@4.1.94.Final/io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:412)\n\tat io.netty.codec@4.1.94.Final/io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:103)\n\tat io.netty.transport@4.1.94.Final/io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:444)\n\tat io.netty.transport@4.1.94.Final/io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420)\n\tat io.netty.transport@4.1.94.Final/io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:412)\n\tat io.netty.codec@4.1.94.Final/io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:103)\n\tat io.netty.transport@4.1.94.Final/io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:444)\n\tat io.netty.transport@4.1.94.Final/io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420)\n\tat io.netty.transport@4.1.94.Final/io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:412)\n\tat org.elasticsearch.transport.netty4@8.10.2/org.elasticsearch.http.netty4.Netty4HttpHeaderValidator.forwardData(Netty4HttpHeaderValidator.java:194)\n\tat org.elasticsearch.transport.netty4@8.10.2/org.elasticsearch.http.netty4.Netty4HttpHeaderValidator.forwardFullRequest(Netty4HttpHeaderValidator.java:137)\n\tat org.elasticsearch.transport.netty4@8.10.2/org.elasticsearch.http.netty4.Netty4HttpHeaderValidator.lambda$requestStart$1(Netty4HttpHeaderValidator.java:120)\n\tat io.netty.common@4.1.94.Final/io.netty.util.concurrent.PromiseTask.runTask(PromiseTask.java:98)\n\tat io.netty.common@4.1.94.Final/io.netty.util.concurrent.PromiseTask.run(PromiseTask.java:106)\n\tat io.netty.common@4.1.94.Final/io.netty.util.concurrent.AbstractEventExecutor.runTask(AbstractEventExecutor.java:174)\n\tat io.netty.common@4.1.94.Final/io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:167)\n\tat io.netty.common@4.1.94.Final/io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:470)\n\tat io.netty.transport@4.1.94.Final/io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:566)\n\tat io.netty.common@4.1.94.Final/io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:997)\n\tat io.netty.common@4.1.94.Final/io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)\n\tat java.base/java.lang.Thread.run(Thread.java:1623)\n"
},
"stack_trace" : "java.lang.IllegalArgumentException: [slices] must be a positive integer or the string "auto", but was [Elastic.Clients.Elasticsearch.Slices]\n\tat org.elasticsearch.reindex.AbstractBaseReindexRestHandler.parseSlices(AbstractBaseReindexRestHandler.java:135)\n\tat org.elasticsearch.reindex.AbstractBaseReindexRestHandler.setCommonOptions(AbstractBaseReindexRestHandler.java:88)\n\tat org.elasticsearch.reindex.AbstractBaseReindexRestHandler.doPrepareRequest(AbstractBaseReindexRestHandler.java:45)\n\tat org.elasticsearch.reindex.RestUpdateByQueryAction.prepareRequest(RestUpdateByQueryAction.java:54)\n\tat org.elasticsearch.server@8.10.2/org.elasticsearch.rest.BaseRestHandler.handleRequest(BaseRestHandler.java:80)\n\tat org.elasticsearch.security@8.10.2/org.elasticsearch.xpack.security.rest.SecurityRestFilter.doHandleRequest(SecurityRestFilter.java:96)\n\tat org.elasticsearch.security@8.10.2/org.elasticsearch.xpack.security.rest.SecurityRestFilter.lambda$handleRequest$0(SecurityRestFilter.java:87)\n\tat org.elasticsearch.server@8.10.2/org.elasticsearch.action.ActionListener$2.onResponse(ActionListener.java:177)\n\tat org.elasticsearch.security@8.10.2/org.elasticsearch.xpack.security.authc.support.SecondaryAuthenticator.lambda$authenticateAndAttachToContext$3(SecondaryAuthenticator.java:99)\n\tat org.elasticsearch.server@8.10.2/org.elasticsearch.action.ActionListenerImplementations$ResponseWrappingActionListener.onResponse(ActionListenerImplementations.java:236)\n\tat org.elasticsearch.security@8.10.2/org.elasticsearch.xpack.security.authc.support.SecondaryAuthenticator.authenticate(SecondaryAuthenticator.java:109)\n\tat org.elasticsearch.security@8.10.2/org.elasticsearch.xpack.security.authc.support.SecondaryAuthenticator.authenticateAndAttachToContext(SecondaryAuthenticator.java:90)\n\tat org.elasticsearch.security@8.10.2/org.elasticsearch.xpack.security.rest.SecurityRestFilter.handleRequest(SecurityRestFilter.java:82)\n\tat org.elasticsearch.server@8.10.2/org.elasticsearch.rest.RestController.dispatchRequest(RestController.java:415)\n\tat org.elasticsearch.server@8.10.2/org.elasticsearch.rest.RestController.tryAllHandlers(RestController.java:544)\n\tat org.elasticsearch.server@8.10.2/org.elasticsearch.rest.RestController.dispatchRequest(RestController.java:317)\n\tat org.elasticsearch.server@8.10.2/org.elasticsearch.http.AbstractHttpServerTransport.dispatchRequest(AbstractHttpServerTransport.java:453)\n\tat org.elasticsearch.server@8.10.2/org.elasticsearch.http.AbstractHttpServerTransport.handleIncomingRequest(AbstractHttpServerTransport.java:549)\n\tat org.elasticsearch.server@8.10.2/org.elasticsearch.http.AbstractHttpServerTransport.incomingRequest(AbstractHttpServerTransport.java:426)\n\tat org.elasticsearch.transport.netty4@8.10.2/org.elasticsearch.http.netty4.Netty4HttpPipeliningHandler.handlePipelinedRequest(Netty4HttpPipeliningHandler.java:128)\n\tat org.elasticsearch.transport.netty4@8.10.2/org.elasticsearch.http.netty4.Netty4HttpPipeliningHandler.channelRead(Netty4HttpPipeliningHandler.java:118)\n\tat io.netty.transport@4.1.94.Final/io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:442)\n\tat io.netty.transport@4.1.94.Final/io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420)\n\tat io.netty.transport@4.1.94.Final/io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:412)\n\tat io.netty.codec@4.1.94.Final/io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:103)\n\tat io.netty.transport@4.1.94.Final/io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:444)\n\tat io.netty.transport@4.1.94.Final/io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420)\n\tat io.netty.transport@4.1.94.Final/io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:412)\n\tat io.netty.codec@4.1.94.Final/io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:103)\n\tat io.netty.transport@4.1.94.Final/io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:444)\n\tat io.netty.transport@4.1.94.Final/io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420)\n\tat io.netty.transport@4.1.94.Final/io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:412)\n\tat org.elasticsearch.transport.netty4@8.10.2/org.elasticsearch.http.netty4.Netty4HttpHeaderValidator.forwardData(Netty4HttpHeaderValidator.java:194)\n\tat org.elasticsearch.transport.netty4@8.10.2/org.elasticsearch.http.netty4.Netty4HttpHeaderValidator.forwardFullRequest(Netty4HttpHeaderValidator.java:137)\n\tat org.elasticsearch.transport.netty4@8.10.2/org.elasticsearch.http.netty4.Netty4HttpHeaderValidator.lambda$requestStart$1(Netty4HttpHeaderValidator.java:120)\n\tat io.netty.common@4.1.94.Final/io.netty.util.concurrent.PromiseTask.runTask(PromiseTask.java:98)\n\tat io.netty.common@4.1.94.Final/io.netty.util.concurrent.PromiseTask.run(PromiseTask.java:106)\n\tat io.netty.common@4.1.94.Final/io.netty.util.concurrent.AbstractEventExecutor.runTask(AbstractEventExecutor.java:174)\n\tat io.netty.common@4.1.94.Final/io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:167)\n\tat io.netty.common@4.1.94.Final/io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:470)\n\tat io.netty.transport@4.1.94.Final/io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:566)\n\tat io.netty.common@4.1.94.Final/io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:997)\n\tat io.netty.common@4.1.94.Final/io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)\n\tat java.base/java.lang.Thread.run(Thread.java:1623)\nCaused by: java.lang.NumberFormatException: For input string: "Elastic.Clients.Elasticsearch.Slices"\n\tat java.base/java.lang.NumberFormatException.forInputString(NumberFormatException.java:67)\n\tat java.base/java.lang.Integer.parseInt(Integer.java:665)\n\tat java.base/java.lang.Integer.parseInt(Integer.java:781)\n\tat org.elasticsearch.reindex.AbstractBaseReindexRestHandler.parseSlices(AbstractBaseReindexRestHandler.java:133)\n\t... 43 more\n"
},
"status" : 400
}

TCP states:

Established: 11
TimeWait: 1

ThreadPool statistics:

Worker:
Busy: 1
Free: 32766
Min: 12
Max: 32767
IOCP:
Busy: 0
Free: 1000
Min: 1
Max: 1000