7. The network system according to claim 6 , wherein: the processor is further configured to replace indexable application metadata associated with an application in the plurality of third-party applications and stored on the metadata storage device with new indexable application metadata generated by the application.
6. The network system according to claim 5 , wherein: a plurality of third-party applications running on the one or more third-party servers store data in the third-party data storage, and the processor is further configured to store, in the data storage device, indexable application metadata corresponding to data stored in the third-party data storage by an application in the plurality of third-party applications, wherein the indexable application metadata is generated by the application.