Encountered unexpected run state – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 7.6-8.9

Briefly, this error occurs when Elasticsearch encounters an unexpected condition during its operation, which could be due to configuration issues, insufficient resources, or a bug in the software. To resolve this, you can check the Elasticsearch logs for more detailed error messages. Ensure that the Elasticsearch configuration is correct and that there are sufficient resources (CPU, memory, disk space). If the error persists, consider upgrading Elasticsearch to the latest version, as the issue might be a bug that has been fixed in a newer version.

This guide will help you check for common problems that cause the log ” [{}] Encountered unexpected run state [{}] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin.

Log Context

Log “[{}] Encountered unexpected run state [{}]” classname is TransformIndexer.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

            case IDENTIFY_CHANGES:
                return processChangedBuckets(searchResponse);

                // Any other state is a bug; should not happen
                logger.warn("[{}] Encountered unexpected run state [{}]"; getJobId(); runState);
                throw new IllegalStateException("Transform indexer job encountered an illegal state [" + runState + "]");



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