Failed to refresh after decreasing index buffer – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 2.3-2.3

Briefly, this error occurs when Elasticsearch fails to refresh after reducing the index buffer size. This could be due to insufficient memory or a configuration issue. To resolve this, you can try increasing the JVM heap size or adjusting the index buffer size to a value that your system can handle. Additionally, ensure that your system has enough resources to handle the operations. If the problem persists, consider optimizing your indices or deleting unnecessary data to free up resources.

This guide will help you check for common problems that cause the log ” failed to refresh after decreasing index buffer ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: index, refresh and shard.

Log Context

Log “failed to refresh after decreasing index buffer” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                // TODO: should IW have an API to move segments to disk; but not refresh?  Its flush method is protected...
                try {
                    refresh("update index buffer");
                } catch (Throwable e) {
                    logger.warn("failed to refresh after decreasing index buffer"; e);
            } else {


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