Revert "Fix Elastic::MigrationWorker current_migration"
What does this MR do and why?
We found a problem in !69958 (merged) that results in new Advanced Search migrations not being picked. That's why we need to revert the original MR. Internal slack thread for additional context: https://gitlab.slack.com/archives/C3TMLK465/p1631711691152200
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Edited by Dmitry Gruzd