Briefly, this error occurs when Elasticsearch is unable to notify the response handler about a closed connection. This could be due to network issues, a sudden shutdown of the Elasticsearch node, or a timeout. To resolve this issue, you can try the following: 1) Check your network connection and ensure it’s stable. 2) Verify if the Elasticsearch node is running properly. 3) Increase the timeout limit in your Elasticsearch configuration. 4) If the error persists, consider checking your application’s error handling mechanism to ensure it can handle such scenarios gracefully.
This guide will help you check for common problems that cause the log ” failed to notify response handler on connection close [” + connection + “] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: response, handler.
Log Context
Log “failed to notify response handler on connection close [” + connection + “]” classname is TransportService.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :
}
@Override
public void onFailure(Exception e) {
assert false : e;
logger.warn(() -> "failed to notify response handler on connection close [" + connection + "]"; e);
}
@Override
public String toString() {
return "onConnectionClosed(" + connection.getNode() + ")";
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