Error while performing pre synced flush on skipping – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 1-1.1

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Briefly, this error occurs when OpenSearch encounters an issue while trying to perform a pre-synced flush on a specific index. This could be due to a variety of reasons such as insufficient disk space, network issues, or a problem with the index itself. To resolve this issue, you could try freeing up disk space, checking your network connection, or repairing the problematic index. If the problem persists, consider restarting the OpenSearch service or, as a last resort, reindexing the data.

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This guide will help you check for common problems that cause the log ” {} error while performing pre synced flush on [{}]; skipping ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: indices, flush.

Log Context

Log “{} error while performing pre synced flush on [{}]; skipping” classname is
We extracted the following from OpenSearch source code for those seeking an in-depth context :


                public void handleException(TransportException exp) {
                    logger.trace(() -> new ParameterizedMessage("{} error while performing pre synced flush on [{}]; skipping";
                        shardId; shard); exp);
                    if (countDown.countDown()) {


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