Failed to add mapping source – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 2.3-2.3

Briefly, this error occurs when Elasticsearch is unable to add a mapping source due to incorrect mapping syntax, incompatible mapping types, or a conflict with existing mappings. To resolve this issue, you can check and correct the mapping syntax, ensure the mapping types are compatible, or delete and recreate the index with the correct mappings. If the error persists, consider reducing the complexity of your mappings or increasing the cluster’s resources.

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 add mapping [{}]; source [{}]” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                     logger.debug("[{}] parsed mapping [{}]; and got different sources\noriginal:\n{}\nparsed:\n{}"; index; mappingType; mappingSource; mapperService.documentMapper(mappingType).mappingSource());
                    requiresRefresh = true;
        } catch (Throwable e) {
            logger.warn("[{}] failed to add mapping [{}]; source [{}]"; e; index; mappingType; mappingSource);
            throw e;
        return requiresRefresh;


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