ElasticSearch paging sorting aggregation

Question

.Index("onoff-products-tests-main")
.RequestCache(true)
.From(0)
.Size(15)
.Query(q =>
{
QueryContainer container = +q.Terms(c => c
.Field("categories.id")
.Terms(categoryIds));
if (manufacturerIds?.Any() == true)
{ container = container && +q.Terms(ma => ma .Field("manufacturers.id") .Terms(manufacturerIds));
}
if (filteredSpecs?.Any() == true)
{ container = container && +q.Terms(ma => ma .Field("options.id") .Terms(filteredSpecs));
}
if (vendorIds?.Any() == true)
{ container = container && +q.Terms(c => c .Field("vendor.id") .Terms(vendorIds));
}
if (inStorage == true)
{ container = container && +q.Term(c => c .Field("inStorage") .Value(true));
}
if (priceMax.HasValue || priceMin.HasValue)
{ container = container && +q.TermRange(x => x .Field("price") .GreaterThan("0") .LessThan("20"));
} return container;
}).Aggregations(agg => agg .Terms("products_aggregation", x => x.Field("modelName.keyword")
.Include(partition,partition+15)
.Size(15)
.Aggregations(agg2 => agg2
.TopHits("sameModeledProducts_aggregation", s => s.Sort((ss) =>
{ switch (orderBy)
{ case ProductSortingEnum.NameAsc:
return ss.Ascending(ff => ff.Name);
case ProductSortingEnum.NameDesc:
return ss.Descending(ff => ff.Name);
case ProductSortingEnum.PriceAsc:
return ss.Ascending(ff => ff.Price);
case ProductSortingEnum.PriceDesc:
return ss.Descending(ff => ff.Price);
case ProductSortingEnum.MostViewedDesc:
return ss.Descending(ff => ff.Price);
default: return ss.Descending(ff => ff.Price); } })
.Source(ss => ss.Includes(i => i.Field(f => f.Id))) .Size(100)))));

I need to have pagination here plus sorting on parent aggregation and sub aggregation but i dont know what to do pls help me to change this original...