/// <summary>
/// Create a new permanent index in all documents inside this collections if index not exists already.
/// </summary>
/// <param name="property">Property linq expression</param>
/// <param name="unique">Create a unique values index?</param>
public virtual bool EnsureIndex <K>(Expression <Func <T, K> > property, bool unique = false)
{
var p = QueryVisitor.GetProperty <T, K>(property);
return(this.EnsureIndex(p.Name, unique));
}
