I try use NEST library mapping functionality in a next way:
MappingsDescriptor mappingsDescriptor = new MappingsDescriptor();
mappingsDescriptor.Map<**object**>(m => m
.Properties(p => p
.Keyword(k => k
.Name(FilesetHit.Names.FilesetId)
.IncludeInAll(false))
.Number(n => n)
...
How can I set name for ROOT mapping type?