Reindex Elasticsearch wiki index to update integer with long type

Arturo Herrerorequested to merge
502817-reindex-elasticsearch-wikis-to-update-integer-to-long-type into master

Description

This migrates the Elasticsearch wiki index to match the PostgreSQL database types with the Elasticsearch documents indexed from integer to long.

This is based on the changes from !177223 (merged). We need to use Search::Elastic::ReindexingTask since this is also a mapping migration compared to a more traditional migration about data migration. Zero-downtime migration doesn't update any underlying data https://docs.gitlab.com/ee/integration/advanced_search/elasticsearch.html#using-zero-downtime-reindexing.

Related to #502817 (closed).

Edited by Arturo Herrero

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