we need better logging here - loge more information.
we need whole key, and also we can have some logic that analyze how many entity groups we use in the transaction.

at this moment we get this log in the production : 
```
com.google.code.twig.standard.TranslatorObjectDatastore logTransactionEntityGroups: Entity Kind: Contract, Entity Name: 3122041

com.google.code.twig.standard.TranslatorObjectDatastore logTransactionEntityGroups: Entity Kind: Address, Entity Name: null

com.google.code.twig.standard.TranslatorObjectDatastore logTransactionEntityGroups: Entity Kind: ServiceProvisioningEvent, Entity Name: null

com.google.code.twig.standard.TranslatorObjectDatastore logTransactionEntityGroups: Entity Kind: CouponCounters, Entity Name: 3122041

com.google.code.twig.standard.TranslatorObjectDatastore logTransactionEntityGroups: Entity Kind: ProvidedService, Entity Name: null

com.google.code.twig.standard.TranslatorObjectDatastore logTransactionEntityGroups: Entity Kind: ChangeLog, Entity Name: null

com.google.code.twig.standard.TranslatorObjectDatastore logTransactionEntityGroups: Entity Kind: ContractSummaryIndex, Entity Name: 3122041

com.google.code.twig.standard.TranslatorObjectDatastore logTransactionEntityGroups: Entity Kind: Customer, Entity Name: null

com.google.code.twig.standard.TranslatorObjectDatastore logTransactionEntityGroups: Entity Kind: CouponCounter, Entity Name: null

com.google.code.twig.standard.TranslatorObjectDatastore logTransactionEntityGroups: Entity Kind: ContractSearchIndex, Entity Name: 3122041

```