Esent: out of memory

index.cs

public sealed class Debts_ByPayer : AbstractMultiMapIndexCreationTask<PayerInfoForBilling>
{
    public Debts_ByPayer()
    {
        AddMap<Debt>(debts =>
            from debt in debts
            let person = LoadDocument<Person>("people/" + debt.Charging.PersonId.ToString())
            let agreement = LoadDocument<Agreement>(debt.Source.ToString())
            let personIds = person.Id.ToString().Split('/')
            let agreementIds = agreement.Id.ToString().Split('/')
            where debt.CurrentStatus == Debt.Status.Generated
            select new
            {
                PersonId = personIds[1],
                Agreement = new {
                    Id = agreementIds[1],
                    CurrentSituation = agreement.CurrentSituation
                },
                Name = person.Name,
                Cpf = person.Cpf,
                Address = person.Addresses.FirstOrDefault(a => a.Type == Shared.Domain.Address.EType.Home),
                CollectorId = debt.Charging.CollectorId,
                FormOfChargingId = debt.Charging.Id,
                BillingDay = debt.Charging.BillingDay,
                DueDates = debt.DueDate
            });
        Reduce = results =>
            from result in results
            group result by new
            {
                PersonId = result.PersonId,
                Agreement =result.Agreement,
                Name = result.Name,
                Cpf = result.Cpf,
                Address = result.Address,
                CollectorId = result.CollectorId,
                FormOfChargingId = result.FormOfChargingId,
                BillingDay = result.BillingDay
            } into g
            select new
            {
                PersonId = g.Key.PersonId,
                Agreement = g.Key.Agreement,
                Name = g.Key.Name,
                Cpf = g.Key.Cpf,
                Address = g.Key.Address,
                CollectorId = g.Key.CollectorId,
                FormOfChargingId = g.Key.FormOfChargingId,
                BillingDay = g.Key.BillingDay,
                DueDates = g.Select(c => c.DueDates)
            };
    }
}

This is the detailed exception:

Esent out of memory exception for index "Debts/ByPayer", id: 34

Out of memory exception occurred in storage during indexing process for "Debts/ByPayer". Will try to reduce batch size. Consider increasing "Raven/Esent/MaxVerPages" value in configuration. Error: Version store out of memory (cleanup already attempted).

The avg size of the documents is 1,29 Kb

208k documents