adx_setting not found in metadata cache

 System.ServiceModel.FaultException`1[[Microsoft.Xrm.Sdk.OrganizationServiceFault, Microsoft.Xrm.Sdk, Version=8.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35]]: The entity with a name = 'adx_setting' was not found in the MetadataCache.

This on saving a thread in a forum. 

ADX 7.0.0022 - I guess the entity is in a solution i haven't installed already! Any ideas which one?

Thanks,

Phil