Compute the doc range more efficiently when flushing doc block

[bugmakerrrrrr]

Description

Today, we sum all the doc delta to compute the range when flushing doc block, which is equivalent to lastDocID - level0LastDocID.

[stefanvodita]

This might still apply to Lucene103PostingsWriter. Should we rebase?

[jainankitk]

Thanks for updating the PR to include Lucene103PostingsWriter. LGTM!

[stefanvodita]

Thank you for updating the 10.3 postings writer! I'm happy to merge that change, but I would rather not mix in the 10.1 change since that release has already gone out and we're unlikely to release a follow-up unless we find serious bugs.

Could you also add an entry under 10.3 in CHANGES.txt?

[stefanvodita]

Sorry, I don't know if I was clear enough. I was asking if we can also revert the change to Lucene101PostingsWriter and only change Lucene103PostingsWriter this time.

Thanks for adding the changelog entry!

[bugmakerrrrrr]

Sorry, I don't know if I was clear enough. I was asking if we can also revert the change to Lucene101PostingsWriter and only change Lucene103PostingsWriter this time.

Thanks for adding the changelog entry!

My fault, I forgot to revert.

[stefanvodita]

Thank you @bugmakerrrrrr!