After SERVER-32225, users will be able to create multiple text indexes on a single collection. SERVER-32225 actually relaxes the constraint only for system (internal) connections but the rule "one text index per collection" applies to user connections. When the user tries to create indexes on a primary, the actual index building part , spec creation & spec validity check are done by the internal (system) worker thread "IndexBuildsCoordinatorMongod" and not by the parent(user) thread. So, technically a user connection will be able to create multiple text indexes.
EDIT: This ticket will be repurposed to fix the issue mentioned in