Elasticsearch Upgrade from 2.x to 6.x

This category relates to the Enterprise Search set of products - App Search, Site Search and Workplace Search.
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Our enterprise has a good amount of data (multiple clusters each having min 20tb of data) on Elasticsearch 2.x which we are looking to upgrade to 6.x. Since data size is huge, looking to hear back on the best approaches/steps for the migration.
Veena G

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