Increasing the size of the queue in Elasticsearch?

Question

Ive been looking at my elasticsearch logs, and I came across the error

rejected execution (queue capacity 1000) on org.elasticsearch.search.action.SearchServ

Answer 1

From Elasticsearch 5 onward you cannot use the API to update the threadpool search queue size. It is now a node-level settings. See this.

Thread pool settings are now node-level settings. As such, it is not possible to update thread pool settings via the cluster settings API.

To update the threadpool you have to add thread_pool.search.queue_size : in elasticsearch.yml file of each node and then restart elasticsearch.