Briefly, this error occurs when an attempt is made to perform an operation on Elasticsearch after the connection manager has been closed. This could be due to a programming error where the connection is closed before all operations are completed. To resolve this issue, ensure that the connection manager is not closed prematurely. Also, check the order of operations in your code to ensure that all necessary tasks are completed before closing the connection. Additionally, handle exceptions properly to prevent unexpected closure of the connection manager.
This guide will help you check for common problems that cause the log ” connection manager is closed ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: .
Log Context
Log “connection manager is closed” class name is ClusterConnectionManager.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :
if (success == false) {
release.run();
}
}
} else {
listener.onFailure(new ConnectTransportException(node; "connection manager is closed"));
}
} /**
* Connects to the given node; or acquires another reference to an existing connection to the given node if a connection already exists.
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