Timothy Potter Rats! I thought about the windows command file on Saturday but then forgot it completely. Siiigggh. I'll take you up on the testing bits. Thanks for reminding me.
Varun Thacker Solr-8131 defaults to schemaless mode. While related, these are two different beasts from a user's perspective. I've run into lots of situations where the user wants docs to fail indexing first time, every time when it contains undefined fields, fields of an unintended type, etc.. One of the points of this ticket is to accommodate that desire while being able to define fields via the new admin UI. You'll notice that there aren't even any dynamic fields defined in the schema for instance.
I did struggle a bit with whether or not to leave all the fieldTypes defined but in the end decided to leave them in. I became convinced that in managed schema mode they're actually more important than in the manually-edited examples we've been shipping for so long.
bq: If there not being another 5.x release a motive here.
I'll defer to the release manager here and he's spoken. It's not going in 5.4.
Upayavira OK, not going in 5.4