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| If you are running a cluster of ElasticSearch hosts, you should not use the parameter "URL" for a single host, but you can specify multiple hosts by using the parameter names "URL1", "URL2", "URL3",...
Hint: though each host/node within an ElasticSearch cluster can server different roles and not all of them might be appropriate for doing a specific operation (like searching, indexing, etc.), it is possible to send a request to any of the nodes. They will relay the request to a node in the cluster, which has the correct role. This function is called "coordinating node". Every node is implicitly a coordinating node. Therefore, you can list all nodes of the cluster and do not have to filter the list for a specific role. |
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