Test
Major Description
the Compressing impls compress documents into chunks. We then record index data for every N chunks, which is binary searched to find the start of the chunk. today this is always 1024.
This means to test the stored fields index well, we need to index thousands and thousands of documents. But if we randomize the parameter, we can test it more effectively by setting it to very low values (e.g. 5) in tests.