Unexpected failure while sending request – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 6.8-7.15

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Briefly, this error occurs when Elasticsearch encounters an issue while trying to send a request. This could be due to network issues, a problem with the Elasticsearch cluster, or a misconfiguration in the request. To resolve this issue, you can check the network connectivity, ensure the Elasticsearch cluster is running properly, and verify the correctness of the request being sent. Additionally, checking the Elasticsearch logs can provide more detailed information about the cause of the error.

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This guide will help you check for common problems that cause the log ” unexpected failure while sending request [{}] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: cluster, shard, request.

Log Context

Log “unexpected failure while sending request [{}]” classname is ShardStateAction.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                    @Override
                    public void handleException(TransportException exp) {
                        if (isMasterChannelException(exp)) {
                            waitForNewMasterAndRetry(actionName; observer; request; listener; changePredicate);
                        } else {
                            logger.warn(new ParameterizedMessage("unexpected failure while sending request [{}]" +
                                " to [{}] for shard entry [{}]"; actionName; masterNode; request); exp);
                            listener.onFailure(exp instanceof RemoteTransportException ?
                                (Exception) (exp.getCause() instanceof Exception ? exp.getCause() :
                                    new ElasticsearchException(exp.getCause())) : exp);
                        }

 

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