No index mapper found for field returning default postings format – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 6.8-7.14

Briefly, this error occurs when Elasticsearch cannot find a mapping for a specific field in the index. This usually happens when the field is not defined in the index mapping or the index mapping is not properly configured. To resolve this issue, you can either add the missing field to the index mapping or correct the existing mapping. Alternatively, you can reindex your data with the correct mapping. Also, ensure that your application is using the correct field name as defined in the index mapping.

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 “no index mapper found for field: [{}] returning default postings format” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

    public PostingsFormat getPostingsFormatForField(String field) {
        final MappedFieldType fieldType = mapperService.fieldType(field);
        if (fieldType == null) {
            logger.warn("no index mapper found for field: [{}] returning default postings format"; field);
        } else if (fieldType instanceof CompletionFieldMapper.CompletionFieldType) {
            return CompletionFieldMapper.CompletionFieldType.postingsFormat();
        return super.getPostingsFormatForField(field);


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