Updating indices recovery concurrent small file streams from to – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 2.3-2.3

Briefly, this error occurs when Elasticsearch is trying to recover indices and the number of concurrent small file streams is being updated. This could be due to a high load on the system or network issues. To resolve this, you can increase the limit of concurrent small file streams if your system resources allow it. Alternatively, you can try to reduce the load on your system by optimizing your queries or reducing the number of indices. Lastly, check your network connection and ensure it’s stable and fast enough to handle the data transfer.

This guide will help you check for common problems that cause the log ” updating [indices.recovery.concurrent_small_file_streams] from [{}] to [{}] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: indices, recovery and settings.

Log Context

Log “updating [indices.recovery.concurrent_small_file_streams] from [{}] to [{}]” classname is RecoverySettings.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :


            int concurrentSmallFileStreams = settings.getAsInt(INDICES_RECOVERY_CONCURRENT_SMALL_FILE_STREAMS; RecoverySettings.this.concurrentSmallFileStreams);
            if (concurrentSmallFileStreams != RecoverySettings.this.concurrentSmallFileStreams) {
                logger.info("updating [indices.recovery.concurrent_small_file_streams] from [{}] to [{}]"; RecoverySettings.this.concurrentSmallFileStreams; concurrentSmallFileStreams);
                RecoverySettings.this.concurrentSmallFileStreams = concurrentSmallFileStreams;

            RecoverySettings.this.retryDelayNetwork = maybeUpdate(RecoverySettings.this.retryDelayNetwork; settings; INDICES_RECOVERY_RETRY_DELAY_NETWORK);


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