Hi all, Submitted a PR <https://github.com/apache/solr/pull/977> about shard split documentation to illustrate how shard split works - inspired by Ilan's Overseer adoc <https://github.com/apache/solr/blob/main/dev-docs/overseer/overseer.adoc>. I work with David and Bruno; we have been recently looking into shard splitting.
Any feedback would be much appreciated on the PR. -Nazerke
