Task failed with an exception – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 6.8-8.2

Briefly, this error occurs when Elasticsearch encounters an issue while executing a task, which could be due to various reasons such as insufficient resources, incorrect configurations, or a bug in the code. To resolve this issue, you can try the following: 1) Check the Elasticsearch logs for more detailed information about the error. 2) Ensure that Elasticsearch has enough resources (CPU, memory, disk space). 3) Verify your configurations and queries for any mistakes. 4) Update Elasticsearch to the latest version to fix any potential bugs.

This guide will help you check for common problems that cause the log ” task [{}] failed with an exception ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: task, persistent.

Log Context

Log “task [{}] failed with an exception” classname is AllocatedPersistentTask.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                        + (prevState == State.COMPLETED ? "completed" : "locally aborted")
        } else {
            if (failure != null) {
                logger.warn(() -> new ParameterizedMessage("task [{}] failed with an exception"; getPersistentTaskId()); failure);
            } else if (localAbortReason != null) {
                logger.debug("task [{}] aborted locally: [{}]"; getPersistentTaskId(); localAbortReason);
            try {
                this.failure = failure;


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