Hello.
In Hadoop echo system and some other solution: data and metadata are stored separately. For Hadoop, there are master nodes to store metadata.
Question: does Elasticsearch have similar architecture? I mean is there metadata and data separation or ES hold data and metadata as part of the same JSON document?
In Elasticsearch the master-eligible nodes are responsible for the cluster metadata, whereas the data nodes are responsible for the data. A single node can do both roles, or you can separate them. See these docs for more information.
Is it a best practice to separate the master node from data nodes?
In case of a master crashed elastic will elect a new master, right? what will be in this case with metadata? Should master machine configuration be more memory / CPU / disk intensive comparing to the data node?
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