Unexpected exception executing queue entry – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 8.8-8.9

Briefly, this error occurs when Elasticsearch encounters an unexpected issue while executing a queue entry. This could be due to a variety of reasons such as insufficient resources, incorrect configurations, or a bug in the software. To resolve this issue, you could try increasing the system resources, checking and correcting the Elasticsearch configurations, or updating Elasticsearch to the latest version to fix any potential bugs. Additionally, you could also check the Elasticsearch logs for more detailed information about the error, which could help in identifying the root cause and fixing it.

This guide will help you check for common problems that cause the log ” unexpected exception executing queue entry ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: queue, cluster.

Log Context

Log “unexpected exception executing queue entry” classname is MasterService.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :


                public void onFailure(Exception e) {
                    logger.error("unexpected exception executing queue entry"; e);
                    assert false : e;



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