Upgrade to Solr 9.1.x

[DiegoPino]

What?

As documented here apache/lucene@98dafe2 Solr 8/Lucene 8 has a long standing bug that affects our Community (Librarian/Museum) needs for very complex exact matches.

This binds with
esmero/strawberryfield#263

Changes needed are:
New OCR highlight component (moving to 0.8.4), Solr Field types, Schema, Config and core.conf changes. Upgrade itself does not imply loosing data but a reindex is encouraged

Plus code changes to avoid the Solr 9 defaults that don't play with Search API Solr.

I have all tested locally. Will clean, package and make a pull against 1.1.0

[DiegoPino]

This is done, but we have no perfect step by step documentation. Being really the simples way to backup your core. Clear your core, get the new configs + the new OCR library, replace the container and start it again. Then re-index. Honestly that is the only way. But will keep this open I find time to document or someone in the community gives us a hand