Elasticsearch Index Queue Size Is High in OpenSearch

By Opster Team

Updated: Jun 28, 2023

| 2 min read


If the OpenSearch cluster starts to reject indexing requests, there could be a number of causes. Generally it is an indication that one or more nodes cannot keep up with the volume of indexing / delete / update / bulk requests, resulting in a queue building up on that node. Once the indexing queue exceeds the index queue maximum size (as defined here: Threadpools) then the node will start to reject the indexing requests.

How to resolve it

You should check the state of the thread pool to find out whether the indexing rejections are always occurring on the same node, or are spread across all of the nodes.

GET /_cat/thread_pool/index

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