Unable to refresh – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 8.4-8.9

Briefly, this error occurs when Elasticsearch is unable to update the index with the latest data. This could be due to a variety of reasons such as insufficient resources, heavy indexing load, or network issues. To resolve this, you can try reducing the indexing load, increasing system resources, or checking the network connectivity. Additionally, ensure that the refresh interval is set appropriately and not causing excessive refreshes. 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 ” Unable to refresh ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: repository-s3, refresh, repositories.

Log Context

Log “Unable to refresh ” classname is S3Service.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

        public void refresh() {
            try {
            } catch (Exception e) {
                logger.error(() -> "Unable to refresh " + delegate; e);
                throw e;