Briefly, this error occurs when Elasticsearch tries to process a request with a missing or null value for a required header. This could be due to a misconfiguration or an incomplete request. To resolve this issue, you can check the request being sent to ensure all required headers are included and have valid values. Alternatively, you can review your Elasticsearch configuration to ensure all required settings are correctly defined. If the error persists, you may need to debug your code or configuration to identify the source of the null or missing value.
This guide will help you check for common problems that cause the log ” headers must have values; missing for setting [” + fullSetting + “] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin.
Log Context
Log “headers must have values; missing for setting [” + fullSetting + “]” class name is HttpExporter.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :
if (HttpExporter.BLACKLISTED_HEADERS.contains(name)) {
throw new SettingsException("header cannot be overwritten via [" + fullSetting + "]");
}
final List values = settings.getAsList(name);
if (values.isEmpty()) {
throw new SettingsException("headers must have values; missing for setting [" + fullSetting + "]");
}
}
}; Property.Dynamic; Property.NodeScope; Property.DeprecatedWarning);
HTTP_TYPE_DEPENDENCY
);
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