Monitoring fails to serialize results when free swap is reported as negative

[danhermann]

Elasticsearch version (bin/elasticsearch --version): many versions through 7.7.0

Description of the problem including expected versus actual behavior:

On occasion, free swap memory in the monitoring stats is reported as negative and that negative value fails to serialize.

E.g.:

GET _nodes/instance-0000000314/stats?error_trace=true

returns:

{
  "error": {
    "root_cause": [
      {
        "type": "illegal_argument_exception",
        "reason": "Values less than -1 bytes are not supported: -1282646016b",
        "stack_trace": "[Values less than -1 bytes are not supported: -1282646016b]; nested: IllegalArgumentException[Values less than -1 bytes are not supported: -1282646016b];\n\tat org.elasticsearch.ElasticsearchException.guessRootCauses(ElasticsearchException.java:644)\n\tat org.elasticsearch.ElasticsearchException.generateFailureXContent(ElasticsearchException.java:572)\n\tat org.elasticsearch.rest.BytesRestResponse.build(BytesRestResponse.java:138)\n\tat org.elasticsearch.rest.BytesRestResponse.<init>(BytesRestResponse.java:96)\n\tat org.elasticsearch.rest.BytesRestResponse.<init>(BytesRestResponse.java:91)\n\tat org.elasticsearch.rest.action.RestActionListener.onFailure(RestActionListener.java:58)\n\tat org.elasticsearch.rest.action.RestActionListener.onResponse(RestActionListener.java:49)\n\tat org.elasticsearch.action.support.TransportAction$1.onResponse(TransportAction.java:70)\n\tat org.elasticsearch.action.support.TransportAction$1.onResponse(TransportAction.java:64)\n\tat org.elasticsearch.action.support.ContextPreservingActionListener.onResponse(ContextPreservingActionListener.java:43)\n\tat org.elasticsearch.action.support.nodes.TransportNodesAction$AsyncAction.finishHim(TransportNodesAction.java:236)\n\tat org.elasticsearch.action.support.nodes.TransportNodesAction$AsyncAction.onOperation(TransportNodesAction.java:213)\n\tat org.elasticsearch.action.support.nodes.TransportNodesAction$AsyncAction.access$000(TransportNodesAction.java:142)\n\tat org.elasticsearch.action.support.nodes.TransportNodesAction$AsyncAction$1.handleResponse(TransportNodesAction.java:191)\n\tat org.elasticsearch.action.support.nodes.TransportNodesAction$AsyncAction$1.handleResponse(TransportNodesAction.java:183)\n\tat org.elasticsearch.transport.TransportService$ContextRestoreResponseHandler.handleResponse(TransportService.java:1129)\n\tat org.elasticsearch.transport.InboundHandler$1.doRun(InboundHandler.java:222)\n\tat org.elasticsearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:37)\n\tat org.elasticsearch.common.util.concurrent.EsExecutors$DirectExecutorService.execute(EsExecutors.java:225)\n\tat org.elasticsearch.transport.InboundHandler.handleResponse(InboundHandler.java:214)\n\tat org.elasticsearch.transport.InboundHandler.messageReceived(InboundHandler.java:139)\n\tat org.elasticsearch.transport.InboundHandler.inboundMessage(InboundHandler.java:103)\n\tat org.elasticsearch.transport.TcpTransport.inboundMessage(TcpTransport.java:676)\n\tat org.elasticsearch.transport.netty4.Netty4MessageChannelHandler.channelRead(Netty4MessageChannelHandler.java:62)\n\tat io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:377)\n\tat io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:363)\n\tat io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:355)\n\tat io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:321)\n\tat io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:295)\n\tat io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:377)\n\tat io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:363)\n\tat io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:355)\n\tat io.netty.handler.logging.LoggingHandler.channelRead(LoggingHandler.java:227)\n\tat io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:377)\n\tat io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:363)\n\tat io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:355)\n\tat io.netty.handler.ssl.SslHandler.unwrap(SslHandler.java:1470)\n\tat io.netty.handler.ssl.SslHandler.decodeJdkCompatible(SslHandler.java:1219)\n\tat io.netty.handler.ssl.SslHandler.decode(SslHandler.java:1266)\n\tat io.netty.handler.codec.ByteToMessageDecoder.decodeRemovalReentryProtection(ByteToMessageDecoder.java:498)\n\tat io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:437)\n\tat io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:276)\n\tat io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:377)\n\tat io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:363)\n\tat io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:355)\n\tat io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1410)\n\tat io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:377)\n\tat io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:363)\n\tat io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:919)\n\tat io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:163)\n\tat io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:714)\n\tat io.netty.channel.nio.NioEventLoop.processSelectedKeysPlain(NioEventLoop.java:615)\n\tat io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:578)\n\tat io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:493)\n\tat io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:989)\n\tat io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)\n\tat java.base/java.lang.Thread.run(Thread.java:832)\nCaused by: java.lang.IllegalArgumentException: Values less than -1 bytes are not supported: -1282646016b\n\tat org.elasticsearch.common.unit.ByteSizeValue.<init>(ByteSizeValue.java:80)\n\tat org.elasticsearch.common.unit.ByteSizeValue.<init>(ByteSizeValue.java:75)\n\tat org.elasticsearch.monitor.os.OsStats$Swap.getFree(OsStats.java:204)\n\tat org.elasticsearch.monitor.os.OsStats$Swap.toXContent(OsStats.java:219)\n\tat org.elasticsearch.monitor.os.OsStats.toXContent(OsStats.java:114)\n\tat org.elasticsearch.action.admin.cluster.node.stats.NodeStats.toXContent(NodeStats.java:287)\n\tat org.elasticsearch.action.admin.cluster.node.stats.NodesStatsResponse.toXContent(NodesStatsResponse.java:61)\n\tat org.elasticsearch.rest.action.RestActions.nodesResponse(RestActions.java:183)\n\tat org.elasticsearch.rest.action.RestActions$NodesResponseRestListener.buildResponse(RestActions.java:232)\n\tat org.elasticsearch.rest.action.RestActions$NodesResponseRestListener.buildResponse(RestActions.java:223)\n\tat org.elasticsearch.rest.action.RestBuilderListener.buildResponse(RestBuilderListener.java:38)\n\tat org.elasticsearch.rest.action.RestResponseListener.processResponse(RestResponseListener.java:37)\n\tat org.elasticsearch.rest.action.RestActionListener.onResponse(RestActionListener.java:47)\n\t... 50 more\n\tSuppressed: java.lang.IllegalStateException: Failed to close the XContentBuilder\n\t\tat org.elasticsearch.common.xcontent.XContentBuilder.close(XContentBuilder.java:1011)\n\t\tat org.elasticsearch.rest.action.RestBuilderListener.buildResponse(RestBuilderListener.java:37)\n\t\t... 52 more\n\tCaused by: java.io.IOException: Unclosed object or array found\n\t\tat org.elasticsearch.common.xcontent.json.JsonXContentGenerator.close(JsonXContentGenerator.java:469)\n\t\tat org.elasticsearch.common.xcontent.XContentBuilder.close(XContentBuilder.java:1009)\n\t\t... 53 more\n"
      }
    ],
    "type": "illegal_argument_exception",
    "reason": "Values less than -1 bytes are not supported: -1282646016b",
    "stack_trace": "java.lang.IllegalArgumentException: Values less than -1 bytes are not supported: -1282646016b\n\tat org.elasticsearch.common.unit.ByteSizeValue.<init>(ByteSizeValue.java:80)\n\tat org.elasticsearch.common.unit.ByteSizeValue.<init>(ByteSizeValue.java:75)\n\tat org.elasticsearch.monitor.os.OsStats$Swap.getFree(OsStats.java:204)\n\tat org.elasticsearch.monitor.os.OsStats$Swap.toXContent(OsStats.java:219)\n\tat org.elasticsearch.monitor.os.OsStats.toXContent(OsStats.java:114)\n\tat org.elasticsearch.action.admin.cluster.node.stats.NodeStats.toXContent(NodeStats.java:287)\n\tat org.elasticsearch.action.admin.cluster.node.stats.NodesStatsResponse.toXContent(NodesStatsResponse.java:61)\n\tat org.elasticsearch.rest.action.RestActions.nodesResponse(RestActions.java:183)\n\tat org.elasticsearch.rest.action.RestActions$NodesResponseRestListener.buildResponse(RestActions.java:232)\n\tat org.elasticsearch.rest.action.RestActions$NodesResponseRestListener.buildResponse(RestActions.java:223)\n\tat org.elasticsearch.rest.action.RestBuilderListener.buildResponse(RestBuilderListener.java:38)\n\tat org.elasticsearch.rest.action.RestResponseListener.processResponse(RestResponseListener.java:37)\n\tat org.elasticsearch.rest.action.RestActionListener.onResponse(RestActionListener.java:47)\n\tat org.elasticsearch.action.support.TransportAction$1.onResponse(TransportAction.java:70)\n\tat org.elasticsearch.action.support.TransportAction$1.onResponse(TransportAction.java:64)\n\tat org.elasticsearch.action.support.ContextPreservingActionListener.onResponse(ContextPreservingActionListener.java:43)\n\tat org.elasticsearch.action.support.nodes.TransportNodesAction$AsyncAction.finishHim(TransportNodesAction.java:236)\n\tat org.elasticsearch.action.support.nodes.TransportNodesAction$AsyncAction.onOperation(TransportNodesAction.java:213)\n\tat org.elasticsearch.action.support.nodes.TransportNodesAction$AsyncAction.access$000(TransportNodesAction.java:142)\n\tat org.elasticsearch.action.support.nodes.TransportNodesAction$AsyncAction$1.handleResponse(TransportNodesAction.java:191)\n\tat org.elasticsearch.action.support.nodes.TransportNodesAction$AsyncAction$1.handleResponse(TransportNodesAction.java:183)\n\tat org.elasticsearch.transport.TransportService$ContextRestoreResponseHandler.handleResponse(TransportService.java:1129)\n\tat org.elasticsearch.transport.InboundHandler$1.doRun(InboundHandler.java:222)\n\tat org.elasticsearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:37)\n\tat org.elasticsearch.common.util.concurrent.EsExecutors$DirectExecutorService.execute(EsExecutors.java:225)\n\tat org.elasticsearch.transport.InboundHandler.handleResponse(InboundHandler.java:214)\n\tat org.elasticsearch.transport.InboundHandler.messageReceived(InboundHandler.java:139)\n\tat org.elasticsearch.transport.InboundHandler.inboundMessage(InboundHandler.java:103)\n\tat org.elasticsearch.transport.TcpTransport.inboundMessage(TcpTransport.java:676)\n\tat org.elasticsearch.transport.netty4.Netty4MessageChannelHandler.channelRead(Netty4MessageChannelHandler.java:62)\n\tat io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:377)\n\tat io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:363)\n\tat io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:355)\n\tat io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:321)\n\tat io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:295)\n\tat io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:377)\n\tat io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:363)\n\tat io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:355)\n\tat io.netty.handler.logging.LoggingHandler.channelRead(LoggingHandler.java:227)\n\tat io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:377)\n\tat io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:363)\n\tat io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:355)\n\tat io.netty.handler.ssl.SslHandler.unwrap(SslHandler.java:1470)\n\tat io.netty.handler.ssl.SslHandler.decodeJdkCompatible(SslHandler.java:1219)\n\tat io.netty.handler.ssl.SslHandler.decode(SslHandler.java:1266)\n\tat io.netty.handler.codec.ByteToMessageDecoder.decodeRemovalReentryProtection(ByteToMessageDecoder.java:498)\n\tat io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:437)\n\tat io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:276)\n\tat io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:377)\n\tat io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:363)\n\tat io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:355)\n\tat io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1410)\n\tat io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:377)\n\tat io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:363)\n\tat io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:919)\n\tat io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:163)\n\tat io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:714)\n\tat io.netty.channel.nio.NioEventLoop.processSelectedKeysPlain(NioEventLoop.java:615)\n\tat io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:578)\n\tat io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:493)\n\tat io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:989)\n\tat io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)\n\tat java.base/java.lang.Thread.run(Thread.java:832)\n\tSuppressed: java.lang.IllegalStateException: Failed to close the XContentBuilder\n\t\tat org.elasticsearch.common.xcontent.XContentBuilder.close(XContentBuilder.java:1011)\n\t\tat org.elasticsearch.rest.action.RestBuilderListener.buildResponse(RestBuilderListener.java:37)\n\t\t... 52 more\n\tCaused by: java.io.IOException: Unclosed object or array found\n\t\tat org.elasticsearch.common.xcontent.json.JsonXContentGenerator.close(JsonXContentGenerator.java:469)\n\t\tat org.elasticsearch.common.xcontent.XContentBuilder.close(XContentBuilder.java:1009)\n\t\t... 53 more\n",
    "suppressed": [
      {
        "type": "illegal_state_exception",
        "reason": "Failed to close the XContentBuilder",
        "caused_by": {
          "type": "i_o_exception",
          "reason": "Unclosed object or array found",
          "stack_trace": "java.io.IOException: Unclosed object or array found\n\tat org.elasticsearch.common.xcontent.json.JsonXContentGenerator.close(JsonXContentGenerator.java:469)\n\tat org.elasticsearch.common.xcontent.XContentBuilder.close(XContentBuilder.java:1009)\n\tat org.elasticsearch.rest.action.RestBuilderListener.buildResponse(RestBuilderListener.java:37)\n\tat org.elasticsearch.rest.action.RestResponseListener.processResponse(RestResponseListener.java:37)\n\tat org.elasticsearch.rest.action.RestActionListener.onResponse(RestActionListener.java:47)\n\tat org.elasticsearch.action.support.TransportAction$1.onResponse(TransportAction.java:70)\n\tat org.elasticsearch.action.support.TransportAction$1.onResponse(TransportAction.java:64)\n\tat org.elasticsearch.action.support.ContextPreservingActionListener.onResponse(ContextPreservingActionListener.java:43)\n\tat org.elasticsearch.action.support.nodes.TransportNodesAction$AsyncAction.finishHim(TransportNodesAction.java:236)\n\tat org.elasticsearch.action.support.nodes.TransportNodesAction$AsyncAction.onOperation(TransportNodesAction.java:213)\n\tat org.elasticsearch.action.support.nodes.TransportNodesAction$AsyncAction.access$000(TransportNodesAction.java:142)\n\tat org.elasticsearch.action.support.nodes.TransportNodesAction$AsyncAction$1.handleResponse(TransportNodesAction.java:191)\n\tat org.elasticsearch.action.support.nodes.TransportNodesAction$AsyncAction$1.handleResponse(TransportNodesAction.java:183)\n\tat org.elasticsearch.transport.TransportService$ContextRestoreResponseHandler.handleResponse(TransportService.java:1129)\n\tat org.elasticsearch.transport.InboundHandler$1.doRun(InboundHandler.java:222)\n\tat org.elasticsearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:37)\n\tat org.elasticsearch.common.util.concurrent.EsExecutors$DirectExecutorService.execute(EsExecutors.java:225)\n\tat org.elasticsearch.transport.InboundHandler.handleResponse(InboundHandler.java:214)\n\tat org.elasticsearch.transport.InboundHandler.messageReceived(InboundHandler.java:139)\n\tat org.elasticsearch.transport.InboundHandler.inboundMessage(InboundHandler.java:103)\n\tat org.elasticsearch.transport.TcpTransport.inboundMessage(TcpTransport.java:676)\n\tat org.elasticsearch.transport.netty4.Netty4MessageChannelHandler.channelRead(Netty4MessageChannelHandler.java:62)\n\tat io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:377)\n\tat io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:363)\n\tat io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:355)\n\tat io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:321)\n\tat io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:295)\n\tat io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:377)\n\tat io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:363)\n\tat io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:355)\n\tat io.netty.handler.logging.LoggingHandler.channelRead(LoggingHandler.java:227)\n\tat io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:377)\n\tat io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:363)\n\tat io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:355)\n\tat io.netty.handler.ssl.SslHandler.unwrap(SslHandler.java:1470)\n\tat io.netty.handler.ssl.SslHandler.decodeJdkCompatible(SslHandler.java:1219)\n\tat io.netty.handler.ssl.SslHandler.decode(SslHandler.java:1266)\n\tat io.netty.handler.codec.ByteToMessageDecoder.decodeRemovalReentryProtection(ByteToMessageDecoder.java:498)\n\tat io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:437)\n\tat io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:276)\n\tat io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:377)\n\tat io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:363)\n\tat io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:355)\n\tat io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1410)\n\tat io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:377)\n\tat io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:363)\n\tat io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:919)\n\tat io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:163)\n\tat io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:714)\n\tat io.netty.channel.nio.NioEventLoop.processSelectedKeysPlain(NioEventLoop.java:615)\n\tat io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:578)\n\tat io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:493)\n\tat io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:989)\n\tat io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)\n\tat java.base/java.lang.Thread.run(Thread.java:832)\n"
        },
        "stack_trace": "java.lang.IllegalStateException: Failed to close the XContentBuilder\n\tat org.elasticsearch.common.xcontent.XContentBuilder.close(XContentBuilder.java:1011)\n\tat org.elasticsearch.rest.action.RestBuilderListener.buildResponse(RestBuilderListener.java:37)\n\tat org.elasticsearch.rest.action.RestResponseListener.processResponse(RestResponseListener.java:37)\n\tat org.elasticsearch.rest.action.RestActionListener.onResponse(RestActionListener.java:47)\n\tat org.elasticsearch.action.support.TransportAction$1.onResponse(TransportAction.java:70)\n\tat org.elasticsearch.action.support.TransportAction$1.onResponse(TransportAction.java:64)\n\tat org.elasticsearch.action.support.ContextPreservingActionListener.onResponse(ContextPreservingActionListener.java:43)\n\tat org.elasticsearch.action.support.nodes.TransportNodesAction$AsyncAction.finishHim(TransportNodesAction.java:236)\n\tat org.elasticsearch.action.support.nodes.TransportNodesAction$AsyncAction.onOperation(TransportNodesAction.java:213)\n\tat org.elasticsearch.action.support.nodes.TransportNodesAction$AsyncAction.access$000(TransportNodesAction.java:142)\n\tat org.elasticsearch.action.support.nodes.TransportNodesAction$AsyncAction$1.handleResponse(TransportNodesAction.java:191)\n\tat org.elasticsearch.action.support.nodes.TransportNodesAction$AsyncAction$1.handleResponse(TransportNodesAction.java:183)\n\tat org.elasticsearch.transport.TransportService$ContextRestoreResponseHandler.handleResponse(TransportService.java:1129)\n\tat org.elasticsearch.transport.InboundHandler$1.doRun(InboundHandler.java:222)\n\tat org.elasticsearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:37)\n\tat org.elasticsearch.common.util.concurrent.EsExecutors$DirectExecutorService.execute(EsExecutors.java:225)\n\tat org.elasticsearch.transport.InboundHandler.handleResponse(InboundHandler.java:214)\n\tat org.elasticsearch.transport.InboundHandler.messageReceived(InboundHandler.java:139)\n\tat org.elasticsearch.transport.InboundHandler.inboundMessage(InboundHandler.java:103)\n\tat org.elasticsearch.transport.TcpTransport.inboundMessage(TcpTransport.java:676)\n\tat org.elasticsearch.transport.netty4.Netty4MessageChannelHandler.channelRead(Netty4MessageChannelHandler.java:62)\n\tat io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:377)\n\tat io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:363)\n\tat io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:355)\n\tat io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:321)\n\tat io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:295)\n\tat io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:377)\n\tat io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:363)\n\tat io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:355)\n\tat io.netty.handler.logging.LoggingHandler.channelRead(LoggingHandler.java:227)\n\tat io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:377)\n\tat io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:363)\n\tat io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:355)\n\tat io.netty.handler.ssl.SslHandler.unwrap(SslHandler.java:1470)\n\tat io.netty.handler.ssl.SslHandler.decodeJdkCompatible(SslHandler.java:1219)\n\tat io.netty.handler.ssl.SslHandler.decode(SslHandler.java:1266)\n\tat io.netty.handler.codec.ByteToMessageDecoder.decodeRemovalReentryProtection(ByteToMessageDecoder.java:498)\n\tat io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:437)\n\tat io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:276)\n\tat io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:377)\n\tat io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:363)\n\tat io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:355)\n\tat io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1410)\n\tat io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:377)\n\tat io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:363)\n\tat io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:919)\n\tat io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:163)\n\tat io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:714)\n\tat io.netty.channel.nio.NioEventLoop.processSelectedKeysPlain(NioEventLoop.java:615)\n\tat io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:578)\n\tat io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:493)\n\tat io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:989)\n\tat io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)\n\tat java.base/java.lang.Thread.run(Thread.java:832)\nCaused by: java.io.IOException: Unclosed object or array found\n\tat org.elasticsearch.common.xcontent.json.JsonXContentGenerator.close(JsonXContentGenerator.java:469)\n\tat org.elasticsearch.common.xcontent.XContentBuilder.close(XContentBuilder.java:1009)\n\t... 53 more\n"
      }
    ]
  },
  "status": 400
}

May be related to #42725 and #56435.

[elasticmachine]

Pinging @elastic/es-core-features (:Core/Features/Monitoring)