Move Gitlab::Elastic::BulkIndexer to Search::Elastic namespace

aishahsofearequested to merge
gitlab-community/gitlab-org/gitlab:sofea/398183-move-bulk_indexer-to-search-elastic into master

Moves Gitlab::Elastic::BulkIndexer to Search::Elastic::BulkIndexer as part of the namespace migration.

Fixes part of #398183 (closed)

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