Draft: Reindex Elasticsearch commit index to update integer with long type
Description
This Elasticsearch migration updates the note mapping to match the PostgreSQL database types with the Elasticsearch documents indexed from integer to long.
Reference:
- https://docs.gitlab.com/development/search/advanced_search_migration_styleguide/#zero-downtime-reindex-migration
- https://docs.gitlab.com/development/search/advanced_search_migration_styleguide/#searchelasticmigrationreindextaskhelper
Related to #502817 (closed).