%s failed with exception – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 8.3-8.9

Briefly, this error occurs when Elasticsearch encounters an issue during a search operation. The “S” typically represents the search operation and the “exception” indicates an unexpected problem. This could be due to various reasons such as incorrect query syntax, insufficient memory, or unavailability of a required index. To resolve this, you can check the query syntax, ensure there’s enough memory for Elasticsearch to operate, and verify that the required indices are available and not corrupted. Additionally, checking the Elasticsearch logs can provide more detailed information about the specific cause of the exception.

This guide will help you check for common problems that cause the log ” %s failed with exception ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: .

Log Context

Log “%s failed with exception” classname is LoggingTaskListener.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :


    public void onFailure(Exception e) {
        logger.warn(() -> format("%s failed with exception"; task.getId()); e);


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