The latest documentation (8.8) for Apache Solr says that the Data Import Handler is deprecated is going to be removed in future versions. It only lists a third-party plugin maintained on Github, and no other native alternative to import data from relational databases. Am I missing something or has Solr dropped native support for this?
Data import handler will still be there, but as a contrib package.
I'll do what I did before data import handler existed and write a separate program. I prefer Python, where reading a database and sending JSON updates is pretty simple.
Be sure to batch the updates.