Elasticsearch Reindex / migration

ElasticSearch: Zero downtime reindexing
ElasticSearch has a solution to the problem, index aliases. The alias is like a symbolic link which can point to one or more indices. It gives us the flexibility to create a new index in the background and making the changes in a way that is almost unnoticeable to the application.

Reference

• Elasticsearch reindex APIhttps://www.elastic.co/guide/en/elasticsearch/reference/current/docs-reindex.html
• Elasticsearch reindex 1 https://nasa.github.io/cumulus/docs/troubleshooting/reindex-elasticsearch
• reindex status https://nasa.github.io/cumulus-api/#reindex-status
• Elasticsearch reindex explained https://youtu.be/nME4ZjfjwiA
• Elasticsearch reindex needs https://dzone.com/articles/elasticsearch-fault-tolerance-reindexing-need-and-1
• Elasticsearch reindex steps https://www.thirdrocktechkno.com/blog/6-steps-to-reindex-elasticsearch-data/