Ignoring unknown index setting with value archiving – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 1-1.1

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Briefly, this error occurs when OpenSearch encounters an unrecognized index setting. The setting is ignored and archived for record-keeping. This could be due to a typo in the setting name, using a deprecated setting, or a setting that is not applicable to the current version of OpenSearch. To resolve this, verify the setting name and its applicability to your OpenSearch version. If it’s deprecated, find the new equivalent setting. If it’s a typo, correct it. Always ensure your settings are compatible with your OpenSearch version to avoid such errors.

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This guide will help you check for common problems that cause the log ” {} ignoring unknown index setting: [{}] with value [{}]; archiving ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: index, cluster, metadata.

Log Context

Log “{} ignoring unknown index setting: [{}] with value [{}]; archiving” classname is MetadataIndexUpgradeService.java.
We extracted the following from OpenSearch source code for those seeking an in-depth context :

    IndexMetadata archiveBrokenIndexSettings(IndexMetadata indexMetadata) {
        final Settings settings = indexMetadata.getSettings();
        final Settings upgrade = indexScopedSettings.archiveUnknownOrInvalidSettings(
            e -> logger.warn("{} ignoring unknown index setting: [{}] with value [{}]; archiving";
                indexMetadata.getIndex(); e.getKey(); e.getValue());
            (e; ex) -> logger.warn(() -> new ParameterizedMessage("{} ignoring invalid index setting: [{}] with value [{}]; archiving";
                indexMetadata.getIndex(); e.getKey(); e.getValue()); ex));
        if (upgrade != settings) {
            return IndexMetadata.builder(indexMetadata).settings(upgrade).build();


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