Stop throttling indexing for shard – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 1-2.9

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Briefly, this error occurs when OpenSearch’s internal mechanism detects that a particular shard is being overwhelmed with indexing requests, causing it to throttle or slow down the indexing process to prevent data loss or corruption. This is usually due to high indexing load or insufficient resources. To resolve this issue, you can consider reducing the indexing load, increasing the resources (like memory or CPU) allocated to OpenSearch, or optimizing your indexing strategy by using bulk requests or adjusting the refresh interval. Additionally, ensure your shards are properly sized and distributed across your nodes to balance the load.

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

Log Context

Log “stop throttling indexing for shard [{}]” classname is
We extracted the following from OpenSearch source code for those seeking an in-depth context :


            if (doThrottle == false) {
                for (IndexShard shard : throttled) {
          "stop throttling indexing for shard [{}]"; shard.shardId());


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