Failed to build index metadata – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 1-2.9

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Briefly, this error occurs when OpenSearch fails to construct the metadata for an index. This could be due to a corrupted index, insufficient permissions, or a disk space issue. To resolve this, you can try to restore the index from a backup, check and adjust the permissions, or free up disk space. Additionally, ensure that the OpenSearch version is compatible with the index version. If the issue persists, consider reindexing the data.

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

Log Context

Log “failed to build index metadata [{}]” classname is
We extracted the following from OpenSearch source code for those seeking an in-depth context :

            } catch (Exception e) {
      "failed to build index metadata [{}]"; request.index());
                throw e;

                silent ? Level.DEBUG : Level.INFO;


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