Briefly, this error occurs when an unexpected condition is encountered in a specific thread of the Elasticsearch process, causing it to terminate abruptly. This could be due to various reasons such as memory issues, incorrect configurations, or bugs in the code. To resolve this issue, you can try the following: 1) Check the Elasticsearch logs for more detailed information about the exception. 2) Ensure that Elasticsearch has sufficient memory and is not running out of heap space. 3) Verify your configurations are correct. 4) Update Elasticsearch to the latest version to fix any potential bugs.
This guide will help you check for common problems that cause the log ” uncaught exception in thread [{}] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: bootstrap, thread.
Log Context
Log “uncaught exception in thread [{}]” classname is ElasticsearchUncaughtExceptionHandler.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :
void onFatalUncaught(final String threadName; final Throwable t) {
logger.error(() -> new ParameterizedMessage("fatal error in thread [{}]; exiting"; threadName); t);
}
void onNonFatalUncaught(final String threadName; final Throwable t) {
logger.warn(() -> new ParameterizedMessage("uncaught exception in thread [{}]"; threadName); t);
}
void halt(int status) {
AccessController.doPrivileged(new PrivilegedHaltAction(status));
}
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