• Index is broken down, stored, and processed as collection of shards
  • Each shard is a complete Lucene Index and cannot be scaled-out
  • Form Lucene performance perspective larger index is faster than series of smaller indices
  • Shards are allocated to nodes and are searched independently
  • At the completion of search individual shards results must be aggregated - too many shards may impact performance
  • Index cannot store documents directly - types are used as buckets to index documents

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