Effect of "Indexing Job Batch Size" in the Sharepoint Online connector

Hi all,

Currently looking into tuning the Sharepoint Online connector for our client such that it hits the throttling cap less often. Throttling happens a lot because of the large number of files, and the connector does not have an exponential back-off policy implemented when hitting the limit, so it will just spin forever.

What effect does the Indexing Job Batch Size number have on the search indexing?

This setting is not documented in the KB anywhere, and the only help text is "The indexing job batch size. 0 to use the default batch size.". I have an idea that it does in fact change the batch size of indexing, but what is the "default" and how many batches are run every refresh interval?