Briefly, this error occurs when a listener in Elasticsearch is triggered multiple times, which is not expected in normal operations. This could be due to a bug in the code or a misconfiguration. To resolve this issue, you can: 1) Review your code to ensure listeners are not being called multiple times. 2) Check your Elasticsearch configuration for any inconsistencies. 3) Update Elasticsearch to the latest version as it might be a known issue that has been fixed. 4) If the error persists, consider seeking help from the Elasticsearch community or support.
This guide will help you check for common problems that cause the log ” A listener was unexpectedly called more than once ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: .
Log Context
Log “A listener was unexpectedly called more than once” classname is Pipeline.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :
*/
final AtomicBoolean listenerHasBeenCalled = new AtomicBoolean(false);
metrics.preIngest();
compoundProcessor.execute(ingestDocument; (result; e) -> {
if (listenerHasBeenCalled.getAndSet(true)) {
logger.warn("A listener was unexpectedly called more than once"; new RuntimeException(e));
assert false : "A listener was unexpectedly called more than once";
} else {
long ingestTimeInNanos = relativeTimeProvider.getAsLong() - startTimeInNanos;
metrics.postIngest(ingestTimeInNanos);
if (e != null) {
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