MappingBuilderImpl.getInnerFields() doesn't work with inner classes

[fprochazka]

Executing

mappingBuilder.build(ProductDocument.class)

Over similar document definition

@ElasticDocument(value = "product")
public class ProductDocument
{
    @ElasticTextField
    private String name;

    @ElasticNestedField
    private List<ProductPriceDocument> prices;

    public static class ProductPriceDocument
    {
        private String type;
        private NumberValue value;
        private CurrencyUnit currency;
    }
}

produces

org.frekele.elasticsearch.mapping.exceptions.InvalidDocumentClassException
	at org.frekele.elasticsearch.mapping.MappingBuilderImpl.getInnerFields(MappingBuilderImpl.java:766)
	at org.frekele.elasticsearch.mapping.MappingBuilderImpl.recursiveFields(MappingBuilderImpl.java:801)
	at org.frekele.elasticsearch.mapping.MappingBuilderImpl.innerBuild(MappingBuilderImpl.java:877)
	at org.frekele.elasticsearch.mapping.MappingBuilderImpl.build(MappingBuilderImpl.java:90)
	at org.frekele.elasticsearch.mapping.MappingBuilderImpl.build(MappingBuilderImpl.java:78)

[frekele]

I will implement this feature.
Thank you for your feedback.