Timed out waiting for completion of tasks – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 8.7-8.8

Briefly, this error occurs when Elasticsearch tasks take longer than the specified timeout period. This could be due to heavy indexing, large data queries, or insufficient resources. To resolve this, you can increase the timeout value, optimize your queries for efficiency, or scale up your Elasticsearch cluster to handle more load. Additionally, consider reviewing your cluster’s health and performance metrics to identify any bottlenecks or issues that could be causing delays.

This guide will help you check for common problems that cause the log ” Timed out waiting for completion of tasks ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: node, admin, cluster.

Log Context

Log “Timed out waiting for completion of tasks” class name is TransportListTasksAction.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 var cancellable = threadPool.schedule(
 () -> future.onFailure(new ElasticsearchTimeoutException("Timed out waiting for completion of tasks"));
 requireNonNullElse(request.getTimeout(); DEFAULT_WAIT_FOR_COMPLETION_TIMEOUT);


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