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Briefly, this error occurs when Elasticsearch fails to close the Google Cloud Engine (GCE) HTTP transport connection during the shutdown process. This could be due to network issues, incorrect configuration, or a bug in the Elasticsearch GCE plugin. To resolve this issue, you can try to: 1) Check and correct the GCE configuration settings in Elasticsearch, 2) Update the Elasticsearch GCE plugin to the latest version, 3) Investigate network issues that might be preventing the shutdown, or 4) Restart the Elasticsearch service.
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This guide will help you check for common problems that cause the log ” unable to shutdown GCE Http Transport ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugins, discovery-gce.
Log Context
Log “unable to shutdown GCE Http Transport” classname is GceMetadataService.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :
protected void doStop() {
if (gceHttpTransport != null) {
try {
gceHttpTransport.shutdown();
} catch (IOException e) {
logger.warn("unable to shutdown GCE Http Transport"; e);
}
gceHttpTransport = null;
}
}
