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Naver, the biggest Internet content service provider in South Korea, develops and distributes mobile and server applications like Naver search portal, Line and Band messengers. Naver developers need to check application logs stored on hundreds of servers and sometimes only on customers' devices. NELO2 is Naver's in-house logging system, built with Elasticsearch, indexing and percolating 1.5 billion logs daily with 126TB of logs stored in seven Elasticsearch clusters.
