using (var session = _store.LightweightSession())
            {

                var product1 = new Root
                {
                    Id = Guid.NewGuid(),
                    Name = "root-1",
                    ChildsLevel1 = new[]{
                        new ChildLevel1{
                            Id = Guid.NewGuid(),
                            Name = "child-1.1",
                            ChildsLevel2 = new [] {
                                new ChildLevel2{
                                    Id = Guid.NewGuid(),
                                    Name = "child-1.1.1"
                                },
                                new ChildLevel2{
                                    Id = Guid.NewGuid(),
                                    Name = "child-1.1.2"
                                }
                            }
                        },
                        new ChildLevel1{
                            Id = Guid.NewGuid(),
                            Name = "child-1.2",
                            ChildsLevel2 = new [] {
                                new ChildLevel2{
                                    Id = Guid.NewGuid(),
                                    Name = "child-1.2.1"
                                },
                                new ChildLevel2{
                                    Id = Guid.NewGuid(),
                                    Name = "child-1.2.2"
                                }
                            }
                        }
                    }
                };

                var product2 = new Root
                {
                    Id = Guid.NewGuid(),
                    Name = "root-2",
                    ChildsLevel1 = new[]{
                        new ChildLevel1{
                            Id = Guid.NewGuid(),
                            Name = "child-2.1",
                            ChildsLevel2 = new [] {
                                new ChildLevel2{
                                    Id = Guid.NewGuid(),
                                    Name = "child-2.1.1"
                                },
                                new ChildLevel2{
                                    Id = Guid.NewGuid(),
                                    Name = "child-2.1.2"
                                }
                            }
                        },
                        new ChildLevel1{
                            Id = Guid.NewGuid(),
                            Name = "child-2.2",
                            ChildsLevel2 = new [] {
                                new ChildLevel2{
                                    Id = Guid.NewGuid(),
                                    Name = "child-2.2.1"
                                },
                                new ChildLevel2{
                                    Id = Guid.NewGuid(),
                                    Name = "child-2.2.2"
                                }
                            }
                        }
                    }
                };

                session.Store(product1);
                session.Store(product2);
                session.SaveChanges();
            }