Header cannot be overwritten via fullSetting – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 7.6-8.9

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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.

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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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