1. An apparatus comprising: a multi-tier storage system comprising a front-end storage tier, a back-end storage tier and a data mover module coupled to the front-end and back-end storage tiers and configured to control movement of data between the storage tiers; and a translator associated with the multi-tier storage system; the translator implementing a plurality of translation services and one or more index tables; a given one of the translation services being configured: to access at least one of the one or more index tables in order to determine a dynamically loadable namespace identifier associated with an application running on an analysis node that communicates with the multi-tier storage system over at least one network; and to instantiate a name node corresponding to the dynamically loadable namespace identifier; the dynamically loadable namespace identifier identifying a dynamically loadable namespace that comprises at least a root element and a plurality of directories; wherein particular objects of an object store of the back-end storage tier are made accessible to the application via the name node; wherein a given one of the one or more index tables stores a plurality of dynamically loadable namespace identifiers, for respective different application types, in association with respective corresponding object identifiers of respective dynamically loadable namespace objects stored in the object store of the back-end storage tier, the dynamically loadable namespace objects identifying respective different sets of objects of the object store that are accessible to respective applications of the respective different application types; wherein a given entry of the given index table for one of the dynamically loadable namespace identifiers comprises its associated object identifier and a location flag indicating if the corresponding name node is currently implemented in one or more of the front-end storage tier, the back-end storage tier and the translator; and wherein the apparatus is implemented using at least one processing device comprising a processor coupled to a memory.