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Elasticsearch - Common maintenance tasks

If you have to administrate an Elasticsearch cluster, there are some common maintenance tasks that you will have to run to keep your data growth under control, backup your indexes and keep the cluster updated.

At the University of Oslo we have a 14 nodes Elasticsearch 5.x cluster (3 master + 2 clients + 4 SSD data+ 5 SAS data). We use it to manage, search, analyze, and explore our logs. It has around 100TB of total storage, around 1,300 indexes and we keep from 3 to 6-12 months of data per index type depending of the type of data they have. 

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