Briefly, this error occurs when an attempt is made to overwrite a header in Elasticsearch using a setting that is not allowed. Elasticsearch has certain headers that are immutable for security and consistency reasons. To resolve this issue, you can either avoid changing the header or create a new header with a different name. If the header is not necessary, you can also remove it. Always ensure that you are following the correct syntax and rules when dealing with headers in Elasticsearch.
This guide will help you check for common problems that cause the log ” header cannot be overwritten via [” + fullSetting + “] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin.
Log Context
Log “header cannot be overwritten via [” + fullSetting + “]” class name is HttpExporter.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :
(key) -> Setting.groupSetting(key + "."; settings -> {
final Set names = settings.names();
for (String name : names) {
final String fullSetting = key + "." + name;
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 + "]");
}
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