final FieldMappers indexName = mapperService.indexName(field);
if (indexName == null) {
logger.warn("no index mapper found for field: [{}] returning default doc values format", field);
return defaultDocValuesFormat;
}
DocValuesFormatProvider docValuesFormat = indexName.mapper().docValuesFormatProvider();
return docValuesFormat != null ? docValuesFormat.get() : defaultDocValuesFormat;
}