Briefly, this error occurs when Elasticsearch tries to read a setting from the configuration file, but the setting is either missing or has no value assigned. This could be due to a typo, incorrect formatting, or a missing setting in the configuration file. To resolve this issue, you should first identify the setting mentioned in the error message. Then, check your Elasticsearch configuration file (usually elasticsearch.yml) and ensure that the setting is correctly defined and has a value assigned. If the setting is not needed, consider removing it from the configuration file.
This guide will help you check for common problems that cause the log ” headers must have values; missing for setting [” + concreteSetting.getKey() + name + “] ” 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 [” + concreteSetting.getKey() + name + “]” class name is HttpExporter.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :
} final Listvalues = headerSettings.getAsList(name); if (values.isEmpty()) { throw new SettingsException("headers must have values; missing for setting [" + concreteSetting.getKey() + name + "]"); } // add each value as a separate header; they literally appear like: // // Warning: abc
