Creating index cause shards mappings – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 1.3-1.3

Briefly, this error occurs when Elasticsearch is unable to create an index due to issues with shard mappings. Shard mappings define the structure of the data in Elasticsearch. The error could be due to incorrect mapping definitions or insufficient resources to create the shards. To resolve this, you can review and correct your mapping definitions, ensure that there are enough resources (like memory and disk space) for shard creation, or adjust the number of shards and replicas in your index settings.

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 “[{}] creating index; cause [{}]; shards [{}]/[{}]; mappings {}” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                    MetaData newMetaData = MetaData.builder(currentState.metaData())
                            .put(indexMetaData; false)

          "[{}] creating index; cause [{}]; shards [{}]/[{}]; mappings {}"; request.index(); request.cause(); indexMetaData.numberOfShards(); indexMetaData.numberOfReplicas(); mappings.keySet());

                    ClusterBlocks.Builder blocks = ClusterBlocks.builder().blocks(currentState.blocks());
                    if (!request.blocks().isEmpty()) {
                        for (ClusterBlock block : request.blocks()) {
                            blocks.addIndexBlock(request.index(); block);


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