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Mastering Elasticsearch 5.x - Third Edition by Bharvi Dixit

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Shard allocation control

One of the primary roles of the master node in an Elasticsearch cluster is allocation of shards on nodes and moving shards from one node to another for balancing the cluster state. In this section, we will see the available settings to control this allocation process.

Allocation awareness

Allocation awareness allows us to configure shards and their replicas' allocation with the use of generic parameters. This comes very handy in cases where you are running the cluster on multiple VMs on the same physical server, on multiple racks, or across multiple availability zones. In these scenarios, if more than one node on the same physical server, same rack, or same availability zone goes down, there would be a huge problem. Shard ...

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