IMPORTANT: No additional bug fixes or documentation updates
will be released for this version. For the latest information, see the
current release documentation.
Rejected requestsedit
When Elasticsearch rejects a request, it stops the operation and returns an error with a
429 response code. Rejected requests are commonly caused by:
-
A depleted thread pool. A depleted
searchorwritethread pool returns aTOO_MANY_REQUESTSerror message. - A circuit breaker error.
-
High indexing pressure that exceeds the
indexing_pressure.memory.limit.
Check rejected tasksedit
To check the number of rejected tasks for each thread pool, use the
cat thread pool API. A high ratio of rejected to
completed tasks, particularly in the search and write thread pools, means
Elasticsearch regularly rejects requests.
GET /_cat/thread_pool?v=true&h=id,name,active,rejected,completed
Prevent rejected requestsedit
Fix high CPU and memory usage
If Elasticsearch regularly rejects requests and other tasks, your cluster likely has high CPU usage or high JVM memory pressure. For tips, see High CPU usage and High JVM memory pressure.
Prevent circuit breaker errors
If you regularly trigger circuit breaker errors, see Circuit breaker errors for tips on diagnosing and preventing them.