Before entries can be added to the index, a writer
should obtain a unique id. The methods to add new entries
to the index require this id as an argument.
The application can implement a custom function to map the writer object
to a string. That string will be used to register or look up an id
in the index.
Before entries can be added to the index, a writer should obtain a unique id. The methods to add new entries to the index require this id as an argument. The application can implement a custom function to map the writer object to a string. That string will be used to register or look up an id in the index.