Index not working on existing data

I can see that when index is created, the index table is empty. the existing data's index won't be created. I can understand this is due to the routing that you create and put index data into index table upon data insert. But this is not a user will expect and you have no way to populate the index table later either. with this condition, the index is really hard to be use.

No files, tests, or entry points are named. Start by locating index creation, routing, and index-table population, then trace how existing records are stored; done means creating an index also covers existing data and provides a way to populate it later.

Written by the indexing model from the issue text.