Briefly, this error occurs when Elasticsearch encounters multiple exceptions and only logs the first few, dropping the rest to prevent log flooding. This usually happens when there are issues with cluster health, such as insufficient resources, network problems, or misconfigurations. To resolve this, you can increase the logging level to DEBUG to get more information about the exceptions. Also, check the health of your cluster, ensure there are enough resources (CPU, memory, disk space), and verify your network connectivity and configurations.
This guide will help you check for common problems that cause the log ” further exceptions were dropped ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: .
Log Context
Log “further exceptions were dropped” class name is RefCountingListener.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :
if (exception == null) {
delegate.onResponse(null);
} else {
final var droppedExceptions = droppedExceptionsRef.getAndSet(0);
if (droppedExceptions > 0) {
exception.addSuppressed(new ElasticsearchException(droppedExceptions + " further exceptions were dropped"));
}
delegate.onFailure(exception);
}
} catch (Exception e) {
assert false : e;
