Reschedule cluster info service was rejected – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 6.8-6.8

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Briefly, this error occurs when Elasticsearch’s cluster info service, which collects and provides information about the cluster, is unable to reschedule its tasks due to resource constraints or internal issues. This could be due to high CPU usage, memory pressure, or thread pool rejections. To resolve this issue, you can try to reduce the load on your cluster by optimizing your queries or increasing your cluster’s resources. Additionally, you can adjust the frequency of the cluster info service’s tasks or disable it if it’s not necessary for your use case.

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This guide will help you check for common problems that cause the log ” Reschedule cluster info service was rejected ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: cluster.

Log Context

Log “Reschedule cluster info service was rejected” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                                logger.trace("Scheduling next run for updating cluster info in: {}"; updateFrequency.toString());
                            try {
                                threadPool.schedule(this; updateFrequency; executorName());
                            } catch (EsRejectedExecutionException ex) {
                                logger.debug("Reschedule cluster info service was rejected"; ex);
            } catch (EsRejectedExecutionException ex) {


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