INDEX NAME TIME FORMAT SETTING getKey invalid index name time format – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-7.5

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Briefly, this error occurs when the time format specified for the index name in Elasticsearch is invalid. The index name time format setting is used to generate index names dynamically based on the current date and time. To resolve this issue, you should check the time format you’ve specified and ensure it adheres to the correct syntax. You can also refer to the Elasticsearch documentation for the correct time format. If the problem persists, consider resetting the index name time format to its default setting.

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This guide will help you check for common problems that cause the log ” [” + INDEX_NAME_TIME_FORMAT_SETTING.getKey() + “] invalid index name time format: [ ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin.

Log Context

Log “[” + INDEX_NAME_TIME_FORMAT_SETTING.getKey() + “] invalid index name time format: [” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 Setting setting = INDEX_NAME_TIME_FORMAT_SETTING.getConcreteSettingForNamespace(;
 String format = setting.exists(config.settings()) ? setting.get(config.settings()) : INDEX_FORMAT;
 try {
 return DateFormatter.forPattern(format).withZone(ZoneOffset.UTC);
 } catch (IllegalArgumentException e) {
 throw new SettingsException("[" + INDEX_NAME_TIME_FORMAT_SETTING.getKey() + "] invalid index name time format: ["
 + format + "]"; e);
 }  public static List> getSettings() {


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