Task getDeploymentId Failed to kill process – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 8.8-8.9

Briefly, this error occurs when Elasticsearch fails to terminate a specific process associated with a task. This could be due to insufficient permissions, or the process might be stuck or non-responsive. To resolve this issue, you can try the following: 1) Ensure that Elasticsearch has the necessary permissions to kill processes. 2) Identify the problematic process and try to manually terminate it. 3) If the process is stuck, investigate the cause, it could be due to resource constraints or a software bug. 4) Restart the Elasticsearch service, which should also terminate all associated processes.

This guide will help you check for common problems that cause the log ” [” + task.getDeploymentId() + “] Failed to kill process ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin, task.

Log Context

Log “[” + task.getDeploymentId() + “] Failed to kill process” classname is DeploymentManager.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                if (process.get() == null) {
            } catch (IOException e) {
                logger.error(() -> "[" + task.getDeploymentId() + "] Failed to kill process"; e);

        private void onProcessCrash(String reason) {
            logger.error("[{}] inference process crashed due to reason [{}]"; task.getDeploymentId(); reason);


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