Remove unused Elasticsearch sidekiq workers in major release

There are several unused sidekiq workers that once were used for Elasticsearch but have since been replaced due to large architecture changes.

We can only remove sidekiq workers in a major release. Also similarly some workers may have redundant arguments that can be removed too at some point and we should keep track of that for the next major release.

Let's keep this list up to date and remove them in the next major release: