Failed to refresh-mapping in cluster state – 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 update the mapping of an index in the cluster state. This could be due to a network issue, a heavy load on the cluster, or a problem with the index itself. To resolve this issue, you can try the following: 1) Check the network connectivity and ensure all nodes are reachable. 2) Reduce the load on the cluster by optimizing your queries or increasing the resources. 3) Check the health of the index and consider reindexing if necessary. 4) Ensure that the mapping is correct and doesn’t contain any errors.

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

Log Context

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

                if (mapper.mappingSource().equals(builder.mapping().source()) == false) {
                    dirty = true;
        } catch (Exception e) {
            logger.warn(() -> new ParameterizedMessage("[{}] failed to refresh-mapping in cluster state"; index); e);
        return dirty;



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