Timed out while waiting to acquire shard lock for – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 8.7-8.9

Briefly, this error occurs when Elasticsearch is unable to acquire a shard lock within a specified time limit. This could be due to heavy indexing or search operations, or a slow disk. To resolve this issue, you can try to reduce the load on your Elasticsearch cluster by optimizing your indexing and search operations. You could also consider upgrading your hardware, specifically your disk I/O. Additionally, increasing the shard lock wait time might help, but this could also lead to other issues like increased latency.

This guide will help you check for common problems that cause the log ” timed out while waiting to acquire shard lock for ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: shard, indices, cluster.

Log Context

Log “timed out while waiting to acquire shard lock for” class name is IndicesClusterStateService.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 new ElasticsearchTimeoutException("timed out while waiting to acquire shard lock for " + shardRouting)
 }  final var indexService = indicesService.indexService(shardRouting.index());


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