Failed to create shard – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 1.3-1.3

Briefly, this error occurs when Elasticsearch is unable to create a new shard due to reasons like insufficient disk space, incorrect configuration, or network connectivity issues. To resolve this, you can free up disk space, check and correct your shard configuration settings, or troubleshoot network connectivity. Additionally, ensure that the Elasticsearch cluster has enough resources to handle the shard creation process.

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

Log Context

Log “[{}][{}] failed to create shard” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

            } catch (IndexShardAlreadyExistsException e) {
                // ignore this; the method call can happen several times
            } catch (Throwable e) {
                logger.warn("[{}][{}] failed to create shard"; e; shardRouting.index();;
                try {
                    indexService.removeShard(shardId; "failed to create [" + ExceptionsHelper.detailedMessage(e) + "]");
                } catch (IndexShardMissingException e1) {
                    // ignore
                } catch (Throwable e1) {


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