Failed to start rollup task – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 7.11-7.11

Briefly, this error occurs when Elasticsearch is unable to initiate a rollup job due to issues like incorrect configuration, insufficient permissions, or lack of resources. To resolve this, you can check the rollup configuration for any errors and correct them. Ensure that the user running the rollup job has the necessary permissions. Also, check if there are sufficient resources (CPU, memory, disk space) available for the task. If the issue persists, consider checking the Elasticsearch logs for more detailed error information.

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

Log Context

Log “failed to start rollup task” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 }; e -> listener.onFailure(
 new ElasticsearchException("Failed to rollup index [" + request.getSourceIndex() + "]"; e))));
 if (indexer.start() == IndexerState.STARTED) {
 } else {
 listener.onFailure(new ElasticsearchException("failed to start rollup task"));


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