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Briefly, this error occurs when Elasticsearch fails to reload the watcher, a feature used for alerting and monitoring. This could be due to a misconfiguration, a problem with the watcher’s state, or insufficient resources. To resolve this issue, you can try the following: 1) Check and correct the watcher configuration, 2) Restart the Elasticsearch node, 3) Increase system resources if they are insufficient, 4) Check the Elasticsearch logs for more detailed error messages, and 5) Ensure the watcher license is active and valid.
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This guide will help you check for common problems that cause the log ” error reloading watcher ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin.
Log Context
Log “error reloading watcher” classname is WatcherService.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :
triggerService.pauseExecution();
int cancelledTaskCount = executionService.clearExecutionsAndQueue(() -> {});
logger.info("reloading watcher; reason [{}]; cancelled [{}] queued tasks"; reason; cancelledTaskCount);
executor.execute(wrapWatcherService(() -> reloadInner(state; reason; false); e -> logger.error("error reloading watcher"; e)));
}
/**
* start the watcher service; load watches in the background
*
