Briefly, this error occurs when Elasticsearch is unable to perform its routine health check, which could be due to various reasons such as network issues, insufficient resources, or configuration problems. To resolve this issue, you can try the following: 1) Check the Elasticsearch logs for more detailed error messages. 2) Verify the network connectivity between your application and Elasticsearch. 3) Ensure that Elasticsearch has sufficient resources (CPU, memory, disk space). 4) Check your Elasticsearch configuration for any errors or inconsistencies.
This guide will help you check for common problems that cause the log ” health check failed ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: monitor.
Log Context
Log “health check failed” classname is FsHealthService.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :
private final byte[] bytesToWrite = UUIDs.randomBase64UUID().getBytes(StandardCharsets.UTF_8);
@Override
public void onFailure(Exception e) {
logger.error("health check failed"; e);
}
@Override
public void onRejection(Exception e) {
if (e instanceof EsRejectedExecutionException esre && esre.isExecutorShutdown()) {
