Full text search engine similar to Solr
Lucene based
"Elastic" scaling
Advanced analysis using aggregation
Easy to understand JSON query syntax
Tool to export logs to ElasticSearch
Possible filtering / extraction of data
Easy way to export logs from multiple servers to central repository
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Data analysis through time based aggregations
Visualization building
Dashboard
Caveat:
Almost only for time based data
No support for nested document
...
Only useful for log analysis?