(Very detailed, hands-on course on ElasticSearch for building professional-grade search architectures. The content of the course is through the construction of the ElasticSearch cluster, the installation of various related plug-ins, the construction of the Netty server, the health status of the cluster, the status of each node, the viewing of the index status, backup and backup. The recovery of es, and how to integrate with hadoop, spark, etc., is a very powerful advanced tutorial.)
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