%s failed to refresh index %s – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 8.3-8.9

Briefly, this error occurs when Elasticsearch is unable to refresh an index, which could be due to a variety of reasons such as insufficient disk space, heavy indexing load, or a network issue. To resolve this, you can try the following: 1) Check if there’s enough disk space and free up space if necessary. 2) Reduce the indexing load by optimizing your indexing operations. 3) Check your network connectivity and ensure that Elasticsearch nodes are properly connected. 4) Check the Elasticsearch logs for more detailed error messages that can help identify the root cause.

This guide will help you check for common problems that cause the log ” [%s] failed to refresh index [%s] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin, index, refresh.

Log Context

Log “[%s] failed to refresh index [%s]” classname is TransportPutTrainedModelDefinitionPartAction.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                    if (isEos) {
                            .execute(ActionListener.wrap(refreshed -> listener.onResponse(AcknowledgedResponse.TRUE); failure -> {
                                logger.warn(() -> format("[%s] failed to refresh index [%s]"; request.getModelId(); indexName); failure);


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