The ubiquity of public cloud platforms has made it easy to offload operational overhead of maintaining on-premise systems and leverage the ability to scale these systems on-demand in a matter of minutes. But architecting a secure scalable systems in the public cloud comes with its own challenges. This problem is further complicated when you are migrating from an on-premise system. Such migrations often require infrastructure to operate in a hybrid state where some parts of the system have been migrated to the cloud while remaining components continue to run on-premise. We must also ensure that the migration is invisible to the user and there is no impact to overall availability of the system during this transition. Recently Box Search underwent such a migration for our Solr indexing pipeline and document store which involved migrating hundreds of terabytes of customer data from on-premise to GCP. In this talk we present the overall system architecture, the migration process and some of the challenges we encountered when running this system in a hybrid state.