Remove deprecated code for 4.3.0

Automatically closed - issue fixed for 2 weeks with no activity.

Apologies for leaving a comment on an issue closed 2 years ago, but is there any chance of reverting this? Then include it in a 5.x.x version.

I wouldn't expect a breaking change in a minor version update, going from 4.2.x to 4.3.x breaks some functionalities because of the hooks removed here.

I'm basing all of that on what Semantic Versioning describes: https://semver.org/#summary

Given a version number MAJOR.MINOR.PATCH, increment the:

MAJOR version when you make incompatible API changes
MINOR version when you add functionality in a backward compatible manner
PATCH version when you make backward compatible bug fixes
Additional labels for pre-release and build metadata are available as extensions to the MAJOR.MINOR.PATCH format.

This is also not mentioned in the release notes section on "How to upgrade from 4.2.x or earlier". https://www.drupal.org/project/search_api_solr/releases/4.3.0 →

Just wanted to finish with a big thank you for all the hard work you do while maintaining the module!