+ enum FieldType.nested
Added Size property to CompletionSuggestDescriptor

This will allow users to now specific the size of the completion
results, which defaults to 5.
Merge pull request #488 from lukapor/master

+ enum FieldType.nested
Merge pull request #490 from bgiromini/master

Added Size property to CompletionSuggestDescriptor
started on nested aggregation
Merge branch 'master' of github.com:Mpdreamz/NEST into feature/aggregations
added support for nested aggregation type