When indexing most null values in business classes specifying e.g. nullValue="nullVal" at each of @SearchableProperty is quite risky when one has a lot of classes. A parameter allowing to set default null value would come in handy. When set it would input given value as nulls without defining explicitly in @SearchableProperty. If not set it would input "" from default return value in annotation definition. The only problem is turning off null indexing for some properties. This could be done by new parameter e.g. skippNullValue=true or any equivalent.