Failed to update master on updated mapping for index – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 1.7-1.7

Briefly, this error occurs when Elasticsearch is unable to update the mapping of an index on the master node. This could be due to network issues, heavy load on the master node, or the master node being unavailable. To resolve this issue, you can try the following: 1) Check the network connectivity between the nodes. 2) Reduce the load on the master node by optimizing your queries or adding more nodes to the cluster. 3) If the master node is unavailable, ensure it’s up and running or promote another node to be the master.

In addition we recommend you run the Elasticsearch Template Optimizer to fix problems in your data modeling.

It will analyze your templates to detect issues and improve search performance, reduce indexing bottlenecks and optimize storage utilization. The Template Optimizer is free and requires no installation.

Log Context

Log “Failed to update master on updated mapping for index [” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                             DiscoveryNode node = clusterService.localNode();
                            mappingRequest = new MappingUpdatedAction.MappingUpdatedRequest(
                                    change.index; change.indexUUID; change.documentMapper.type(); change.documentMapper.mappingSource(); orderId; node != null ? : null
                        } catch (Throwable t) {
                            logger.warn("Failed to update master on updated mapping for index [" + change.index + "]; type [" + change.documentMapper.type() + "]"; t);
                        logger.trace("sending mapping updated to master: {}"; mappingRequest);
                        execute(mappingRequest; new ActionListener() {


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